Move ReadFileToString to the base namespace.

chrome/browser/ui/cocoa/extensions/extension_installed_bubble_controller_unittest.mm

 // 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 49 matching lines @@
             &command_line, base::FilePath(), false);
   }
 
   // Load test icon from extension test directory.
   SkBitmap LoadTestIcon() {
     base::FilePath path;
     PathService::Get(chrome::DIR_TEST_DATA, &path);
     path = path.AppendASCII("extensions").AppendASCII("icon1.png");
 
     std::string file_contents;
-    file_util::ReadFileToString(path, &file_contents);
+    base::ReadFileToString(path, &file_contents);
     const unsigned char* data =
         reinterpret_cast<const unsigned char*>(file_contents.data());
 
     SkBitmap bitmap;
     gfx::PNGCodec::Decode(data, file_contents.length(), &bitmap);
     return bitmap;
   }
 
   // Create a skeletal framework of either page action or browser action
   // type.  This extension only needs to have a type and a name to initialize
@@ skipping 222 matching lines @@
   int minHeight = extension_installed_bubble::kIconSize +
     (2 * extension_installed_bubble::kOuterVerticalMargin);
   EXPECT_GT(height, minHeight);
 
   // Make sure the "show me" link is visible.
   EXPECT_FALSE([[controller appInstalledShortcutLink] isHidden]);
 
   [controller close];
 }