Move ReadFileToString to the base namespace.

chrome/browser/sync_file_system/local/canned_syncable_file_system.cc

 // Copyright 2013 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 "chrome/browser/sync_file_system/local/canned_syncable_file_system.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/bind.h"
@@ skipping 89 matching lines @@
     base::PlatformFileError result,
     const base::PlatformFileInfo& file_info,
     const base::FilePath& platform_path,
     const scoped_refptr<webkit_blob::ShareableFileReference>& /* file_ref */) {
   if (result != base::PLATFORM_FILE_OK) {
     callback.Run(result);
     return;
   }
   EXPECT_EQ(expected_data.size(), static_cast<size_t>(file_info.size));
   std::string data;
-  const bool read_status = file_util::ReadFileToString(platform_path, &data);
+  const bool read_status = base::ReadFileToString(platform_path, &data);
   EXPECT_TRUE(read_status);
   EXPECT_EQ(expected_data, data);
   callback.Run(result);
 }
 
 void OnCreateSnapshotFile(
     base::PlatformFileInfo* file_info_out,
     base::FilePath* platform_path_out,
     const CannedSyncableFileSystem::StatusCallback& callback,
     base::PlatformFileError result,
@@ skipping 549 matching lines @@
   sync_status_ = status;
   base::MessageLoop::current()->Quit();
 }
 
 void CannedSyncableFileSystem::InitializeSyncStatusObserver() {
   ASSERT_TRUE(io_task_runner_->RunsTasksOnCurrentThread());
   backend()->sync_context()->sync_status()->AddObserver(this);
 }
 
 }  // namespace sync_file_system