Move ReadFileToString to the base namespace.

chrome/browser/extensions/extension_action_icon_factory_unittest.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/extensions/extension_action_icon_factory.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 52 matching lines @@
     bitmap.eraseColor(SkColorSetARGB(0, 0, 0, 0));
     return gfx::ImageSkiaRep(bitmap, scale_factor);
 }
 
 gfx::Image LoadIcon(const std::string& filename) {
   base::FilePath path;
   PathService::Get(chrome::DIR_TEST_DATA, &path);
   path = path.AppendASCII("extensions/api_test").AppendASCII(filename);
 
   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 gfx::Image::CreateFrom1xBitmap(bitmap);
 }
 
 class ExtensionActionIconFactoryTest
@@ skipping 209 matching lines @@
   icon = icon_factory.GetIcon(1);
 
   EXPECT_TRUE(ImageRepsAreEqual(
       default_icon.ToImageSkia()->GetRepresentation(ui::SCALE_FACTOR_100P),
       icon.ToImageSkia()->GetRepresentation(ui::SCALE_FACTOR_100P)));
 
 }
 
 }  // namespace
 }  // namespace extensions