Added CacheEntry implementation.

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 "base/platform_file.h"
@@ skipping 25 matching lines @@
 #endif
 
   return true;
 }
 
 Storage::~Storage() {
   base::ClosePlatformFile(file_);
 }
 
 bool Storage::Read(void* buffer, int32 size, int32 offset) {
-  DCHECK(buffer);
   DCHECK(offset >= 0 && offset + size <= size_);
 
   int rv = base::ReadPlatformFile(file_, offset, static_cast<char*>(buffer),
                                   size);
   return rv == size;
 }
 
 bool Storage::Write(const void* buffer, int32 size, int32 offset) {
-  DCHECK(buffer);
   DCHECK(offset >= 0 && offset + size <= size_);
 
   int rv = base::WritePlatformFile(file_, offset,
                                    static_cast<const char*>(buffer), size);
   return rv == size;
 }
 
 }  // namespace disk_cache