Move ReadFileToString to the base namespace.

chrome/browser/extensions/convert_web_app_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/convert_web_app.h"
 
 #include <string>
 #include <vector>
 
 #include "base/file_util.h"
@@ skipping 33 matching lines @@
 
   icon_file = icon_file.AppendASCII("extensions")
                        .AppendASCII("convert_web_app")
                        .AppendASCII(base::StringPrintf("%i.png", size));
 
   result.url = url;
   result.width = size;
   result.height = size;
 
   std::string icon_data;
-  if (!file_util::ReadFileToString(icon_file, &icon_data)) {
+  if (!base::ReadFileToString(icon_file, &icon_data)) {
     ADD_FAILURE() << "Could not read test icon.";
     return result;
   }
 
   if (!gfx::PNGCodec::Decode(
         reinterpret_cast<const unsigned char*>(icon_data.c_str()),
         icon_data.size(), &result.data)) {
     ADD_FAILURE() << "Could not decode test icon.";
     return result;
   }
@@ skipping 118 matching lines @@
   EXPECT_EQ("", extension->description());
   EXPECT_EQ(web_app.app_url, AppLaunchInfo::GetFullLaunchURL(extension.get()));
   EXPECT_EQ(0u, IconsInfo::GetIcons(extension.get()).map().size());
   EXPECT_EQ(0u, extension->GetActivePermissions()->apis().size());
   ASSERT_EQ(1u, extension->web_extent().patterns().size());
   EXPECT_EQ("*://aaronboodman.com/*",
             extension->web_extent().patterns().begin()->GetAsString());
 }
 
 }  // namespace extensions