Use a direct include of strings headers in chrome/browser/extensions/, part 4.

chrome/browser/extensions/extension_web_ui.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_web_ui.h"
 
 #include <set>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/extensions/image_loader.h"
 #include "chrome/browser/favicon/favicon_util.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 393 matching lines @@
             extensions::ImageLoader::ImageRepresentation::ALWAYS_RESIZE,
             gfx::Size(pixel_size, pixel_size),
             scale_factors[i]));
   }
 
   // LoadImagesAsync actually can run callback synchronously. We want to force
   // async.
   extensions::ImageLoader::Get(profile)->LoadImagesAsync(
       extension, info_list, base::Bind(&RunFaviconCallbackAsync, callback));
 }