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diff --git a/lib/Fuzzer/FuzzerMutate.h b/lib/Fuzzer/FuzzerMutate.h
deleted file mode 100644
index 84b04c0dbf3e..000000000000
--- a/lib/Fuzzer/FuzzerMutate.h
+++ /dev/null
@@ -1,150 +0,0 @@
-//===- FuzzerMutate.h - Internal header for the Fuzzer ----------*- C++ -* ===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-// fuzzer::MutationDispatcher
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_FUZZER_MUTATE_H
-#define LLVM_FUZZER_MUTATE_H
-
-#include "FuzzerDefs.h"
-#include "FuzzerDictionary.h"
-#include "FuzzerOptions.h"
-#include "FuzzerRandom.h"
-
-namespace fuzzer {
-
-class MutationDispatcher {
-public:
-  MutationDispatcher(Random &Rand, const FuzzingOptions &Options);
-  ~MutationDispatcher() {}
-  /// Indicate that we are about to start a new sequence of mutations.
-  void StartMutationSequence();
-  /// Print the current sequence of mutations.
-  void PrintMutationSequence();
-  /// Indicate that the current sequence of mutations was successfull.
-  void RecordSuccessfulMutationSequence();
-  /// Mutates data by invoking user-provided mutator.
-  size_t Mutate_Custom(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Mutates data by invoking user-provided crossover.
-  size_t Mutate_CustomCrossOver(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Mutates data by shuffling bytes.
-  size_t Mutate_ShuffleBytes(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Mutates data by erasing bytes.
-  size_t Mutate_EraseBytes(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Mutates data by inserting a byte.
-  size_t Mutate_InsertByte(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Mutates data by inserting several repeated bytes.
-  size_t Mutate_InsertRepeatedBytes(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Mutates data by chanding one byte.
-  size_t Mutate_ChangeByte(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Mutates data by chanding one bit.
-  size_t Mutate_ChangeBit(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Mutates data by copying/inserting a part of data into a different place.
-  size_t Mutate_CopyPart(uint8_t *Data, size_t Size, size_t MaxSize);
-
-  /// Mutates data by adding a word from the manual dictionary.
-  size_t Mutate_AddWordFromManualDictionary(uint8_t *Data, size_t Size,
-                                            size_t MaxSize);
-
-  /// Mutates data by adding a word from the TORC.
-  size_t Mutate_AddWordFromTORC(uint8_t *Data, size_t Size, size_t MaxSize);
-
-  /// Mutates data by adding a word from the persistent automatic dictionary.
-  size_t Mutate_AddWordFromPersistentAutoDictionary(uint8_t *Data, size_t Size,
-                                                    size_t MaxSize);
-
-  /// Tries to find an ASCII integer in Data, changes it to another ASCII int.
-  size_t Mutate_ChangeASCIIInteger(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Change a 1-, 2-, 4-, or 8-byte integer in interesting ways.
-  size_t Mutate_ChangeBinaryInteger(uint8_t *Data, size_t Size, size_t MaxSize);
-
-  /// CrossOver Data with some other element of the corpus.
-  size_t Mutate_CrossOver(uint8_t *Data, size_t Size, size_t MaxSize);
-
-  /// Applies one of the configured mutations.
-  /// Returns the new size of data which could be up to MaxSize.
-  size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize);
-  /// Applies one of the default mutations. Provided as a service
-  /// to mutation authors.
-  size_t DefaultMutate(uint8_t *Data, size_t Size, size_t MaxSize);
-
-  /// Creates a cross-over of two pieces of Data, returns its size.
-  size_t CrossOver(const uint8_t *Data1, size_t Size1, const uint8_t *Data2,
-                   size_t Size2, uint8_t *Out, size_t MaxOutSize);
-
-  void AddWordToManualDictionary(const Word &W);
-
-  void PrintRecommendedDictionary();
-
-  void SetCorpus(const InputCorpus *Corpus) { this->Corpus = Corpus; }
-
-  Random &GetRand() { return Rand; }
-
-private:
-
-  struct Mutator {
-    size_t (MutationDispatcher::*Fn)(uint8_t *Data, size_t Size, size_t Max);
-    const char *Name;
-  };
-
-  size_t AddWordFromDictionary(Dictionary &D, uint8_t *Data, size_t Size,
-                               size_t MaxSize);
-  size_t MutateImpl(uint8_t *Data, size_t Size, size_t MaxSize,
-                    const std::vector<Mutator> &Mutators);
-
-  size_t InsertPartOf(const uint8_t *From, size_t FromSize, uint8_t *To,
-                      size_t ToSize, size_t MaxToSize);
-  size_t CopyPartOf(const uint8_t *From, size_t FromSize, uint8_t *To,
-                    size_t ToSize);
-  size_t ApplyDictionaryEntry(uint8_t *Data, size_t Size, size_t MaxSize,
-                              DictionaryEntry &DE);
-
-  template <class T>
-  DictionaryEntry MakeDictionaryEntryFromCMP(T Arg1, T Arg2,
-                                             const uint8_t *Data, size_t Size);
-  DictionaryEntry MakeDictionaryEntryFromCMP(const Word &Arg1, const Word &Arg2,
-                                             const uint8_t *Data, size_t Size);
-  DictionaryEntry MakeDictionaryEntryFromCMP(const void *Arg1, const void *Arg2,
-                                             const void *Arg1Mutation,
-                                             const void *Arg2Mutation,
-                                             size_t ArgSize,
-                                             const uint8_t *Data, size_t Size);
-
-  Random &Rand;
-  const FuzzingOptions Options;
-
-  // Dictionary provided by the user via -dict=DICT_FILE.
-  Dictionary ManualDictionary;
-  // Temporary dictionary modified by the fuzzer itself,
-  // recreated periodically.
-  Dictionary TempAutoDictionary;
-  // Persistent dictionary modified by the fuzzer, consists of
-  // entries that led to successfull discoveries in the past mutations.
-  Dictionary PersistentAutoDictionary;
-
-  std::vector<Mutator> CurrentMutatorSequence;
-  std::vector<DictionaryEntry *> CurrentDictionaryEntrySequence;
-
-  static const size_t kCmpDictionaryEntriesDequeSize = 16;
-  DictionaryEntry CmpDictionaryEntriesDeque[kCmpDictionaryEntriesDequeSize];
-  size_t CmpDictionaryEntriesDequeIdx = 0;
-
-  const InputCorpus *Corpus = nullptr;
-  std::vector<uint8_t> MutateInPlaceHere;
-  // CustomCrossOver needs its own buffer as a custom implementation may call
-  // LLVMFuzzerMutate, which in turn may resize MutateInPlaceHere.
-  std::vector<uint8_t> CustomCrossOverInPlaceHere;
-
-  std::vector<Mutator> Mutators;
-  std::vector<Mutator> DefaultMutators;
-};
-
-}  // namespace fuzzer
-
-#endif  // LLVM_FUZZER_MUTATE_H