Move ReadFileToString to the base namespace.

ash/desktop_background/desktop_background_controller.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 "ash/desktop_background/desktop_background_controller.h"
 
 #include "ash/ash_switches.h"
 #include "ash/desktop_background/desktop_background_controller_observer.h"
 #include "ash/desktop_background/desktop_background_view.h"
 #include "ash/desktop_background/desktop_background_widget_controller.h"
@@ skipping 97 matching lines @@
  private:
   friend class base::RefCountedThreadSafe<
       DesktopBackgroundController::WallpaperLoader>;
 
   // Loads a JPEG image from |path|, a trusted file -- note that the image
   // is not loaded in a sandboxed process. Returns an empty pointer on
   // error.
   static scoped_ptr<SkBitmap> LoadSkBitmapFromJPEGFile(
       const base::FilePath& path) {
     std::string data;
-    if (!file_util::ReadFileToString(path, &data)) {
+    if (!base::ReadFileToString(path, &data)) {
       LOG(ERROR) << "Unable to read data from " << path.value();
       return scoped_ptr<SkBitmap>();
     }
 
     scoped_ptr<SkBitmap> bitmap(gfx::JPEGCodec::Decode(
         reinterpret_cast<const unsigned char*>(data.data()), data.size()));
     if (!bitmap)
       LOG(ERROR) << "Unable to decode JPEG data from " << path.value();
     return bitmap.Pass();
   }
@@ skipping 336 matching lines @@
   }
   return moved;
 }
 
 int DesktopBackgroundController::GetBackgroundContainerId(bool locked) {
   return locked ? internal::kShellWindowId_LockScreenBackgroundContainer :
                   internal::kShellWindowId_DesktopBackgroundContainer;
 }
 
 }  // namespace ash