Move ReadFileToString to the base namespace.

chrome/browser/drive/fake_drive_service.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 "chrome/browser/drive/fake_drive_service.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 1189 matching lines @@
   }
 
   if (content_length != end_position) {
     session->uploaded_size = end_position;
     completion_callback.Run(HTTP_RESUME_INCOMPLETE,
                             scoped_ptr<ResourceEntry>());
     return CancelCallback();
   }
 
   std::string content_data;
-  if (!file_util::ReadFileToString(local_file_path, &content_data)) {
+  if (!base::ReadFileToString(local_file_path, &content_data)) {
     session->uploaded_size = end_position;
     completion_callback.Run(GDATA_FILE_ERROR, scoped_ptr<ResourceEntry>());
     return CancelCallback();
   }
   session->uploaded_size = end_position;
 
   // |resource_id| is empty if the upload is for new file.
   if (session->resource_id.empty()) {
     DCHECK(!session->parent_resource_id.empty());
     DCHECK(!session->title.empty());
@@ skipping 419 matching lines @@
       FROM_HERE,
       base::Bind(callback, HTTP_SUCCESS, base::Passed(&resource_list)));
 }
 
 GURL FakeDriveService::GetNewUploadSessionUrl() {
   return GURL("https://upload_session_url/" +
               base::Int64ToString(next_upload_sequence_number_++));
 }
 
 }  // namespace drive