Move ReadFileToString to the base namespace.

chrome/browser/chromeos/login/user_image_loader.cc

 // Copyright (c) 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/chromeos/login/user_image_loader.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 53 matching lines @@
                  task_runner));
 }
 
 void UserImageLoader::LoadImage(
     const std::string& filepath,
     const ImageInfo& image_info,
     scoped_refptr<base::SequencedTaskRunner> task_runner) {
   DCHECK(task_runner->RunsTasksOnCurrentThread());
 
   std::string image_data;
-  file_util::ReadFileToString(base::FilePath(filepath), &image_data);
+  base::ReadFileToString(base::FilePath(filepath), &image_data);
 
   scoped_refptr<ImageDecoder> image_decoder =
       new ImageDecoder(this, image_data, image_codec_);
   {
     base::AutoLock lock(lock_);
     image_info_map_.insert(std::make_pair(image_decoder.get(), image_info));
   }
   image_decoder->Start(task_runner);
 }
 
@@ skipping 61 matching lines @@
         new ImageInfo(info_it->second.size, info_it->second.loaded_cb));
     image_info_map_.erase(decoder);
   }
 
   target_message_loop_->PostTask(
       FROM_HERE,
       base::Bind(image_info->loaded_cb, UserImage()));
 }
 
 }  // namespace chromeos