Revert "Updating the mapped_file_avoid_mmap_posix implementation."

net/disk_cache/disk_cache_test_util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_DISK_CACHE_DISK_CACHE_TEST_UTIL_H_
 #define NET_DISK_CACHE_DISK_CACHE_TEST_UTIL_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/message_loop.h"
 #include "base/timer/timer.h"
 #include "base/tuple.h"
 #include "build/build_config.h"
 
 // Re-creates a given test file inside the cache test folder.
 bool CreateCacheTestFile(const base::FilePath& name);
 
-// Re-creates a given test file inside the cache test folder of the given size.
-bool CreateCacheTestFileWithSize(const base::FilePath& name, size_t size);
-
 // Deletes all file son the cache.
 bool DeleteCache(const base::FilePath& path);
 
 // Fills buffer with random values (may contain nulls unless no_nulls is true).
 void CacheTestFillBuffer(char* buffer, size_t len, bool no_nulls);
 
 // Generates a random key of up to 200 bytes.
 std::string GenerateKey(bool same_length);
 
 // Returns true if the cache is not corrupt.
@@ skipping 67 matching lines @@
   int last_result() const { return last_result_; }
 
  private:
   MessageLoopHelper* helper_;
   int reuse_;
   int last_result_;
   DISALLOW_COPY_AND_ASSIGN(CallbackTest);
 };
 
 #endif  // NET_DISK_CACHE_DISK_CACHE_TEST_UTIL_H_