Remove base's implicit_cast.

content/browser/cache_storage/cache_storage.cc

 // Copyright 2014 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 "content/browser/cache_storage/cache_storage.h"
 
 #include <string>
 
 #include "base/barrier_closure.h"
 #include "base/files/file_util.h"
 #include "base/files/memory_mapped_file.h"
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
 #include "base/metrics/histogram_macros.h"
+#include "base/numerics/safe_conversions.h"
 #include "base/sha1.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/thread_task_runner_handle.h"
 #include "content/browser/cache_storage/cache_storage.pb.h"
 #include "content/browser/cache_storage/cache_storage_cache.h"
 #include "content/browser/cache_storage/cache_storage_scheduler.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 244 matching lines @@
                               base::ThreadTaskRunnerHandle::Get()));
   }
 
   static void WriteIndexWriteToFileInPool(
       const base::FilePath& tmp_path,
       const base::FilePath& index_path,
       const std::string& data,
       const BoolCallback& callback,
       const scoped_refptr<base::SingleThreadTaskRunner>& original_task_runner) {
     int bytes_written = base::WriteFile(tmp_path, data.c_str(), data.size());
-    if (bytes_written != implicit_cast<int>(data.size())) {
+    if (bytes_written != base::checked_cast<int>(data.size())) {
       base::DeleteFile(tmp_path, /* recursive */ false);
       original_task_runner->PostTask(FROM_HERE, base::Bind(callback, false));
     }
 
     // Atomically rename the temporary index file to become the real one.
     bool rv = base::ReplaceFile(tmp_path, index_path, NULL);
     original_task_runner->PostTask(FROM_HERE, base::Bind(callback, rv));
   }
 
   void LoadIndex(scoped_ptr<std::vector<std::string>> names,
@@ skipping 565 matching lines @@
     scoped_ptr<ServiceWorkerResponse> response,
     scoped_ptr<storage::BlobDataHandle> blob_data_handle) {
   base::WeakPtr<CacheStorage> cache_storage = weak_factory_.GetWeakPtr();
 
   callback.Run(error, response.Pass(), blob_data_handle.Pass());
   if (cache_storage)
     scheduler_->CompleteOperationAndRunNext();
 }
 
 }  // namespace content