Remove the flash specific disk cache backend.

net/disk_cache/flash/storage.cc

-// 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.
-
-#include "net/disk_cache/flash/storage.h"
-
-#include <fcntl.h>
-
-#include "base/logging.h"
-#include "net/base/net_errors.h"
-#include "net/disk_cache/flash/format.h"
-
-namespace disk_cache {
-
-Storage::Storage(const base::FilePath& path,
-                 int32 size)
-    : path_(path), size_(size) {
-  COMPILE_ASSERT(kFlashPageSize % 2 == 0, invalid_page_size);
-  COMPILE_ASSERT(kFlashBlockSize % kFlashPageSize == 0, invalid_block_size);
-  DCHECK(size_ % kFlashBlockSize == 0);
-}
-
-bool Storage::Init() {
-  int flags = base::File::FLAG_READ |
-              base::File::FLAG_WRITE |
-              base::File::FLAG_OPEN_ALWAYS;
-
-  file_.Initialize(path_, flags);
-  if (!file_.IsValid())
-    return false;
-
-  // TODO(agayev): if file already exists, do some validation and return either
-  // true or false based on the result.
-
-#if defined(OS_LINUX)
-  fallocate(file_.GetPlatformFile(), 0, 0, size_);
-#endif
-
-  return true;
-}
-
-Storage::~Storage() {
-}
-
-bool Storage::Read(void* buffer, int32 size, int32 offset) {
-  DCHECK(offset >= 0 && offset + size <= size_);
-
-  int rv = file_.Read(offset, static_cast<char*>(buffer), size);
-  return rv == size;
-}
-
-bool Storage::Write(const void* buffer, int32 size, int32 offset) {
-  DCHECK(offset >= 0 && offset + size <= size_);
-
-  int rv = file_.Write(offset, static_cast<const char*>(buffer), size);
-  return rv == size;
-}
-
-}  // namespace disk_cache