Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/ui/content_settings/content_setting_image_model_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 "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/content_settings/host_content_settings_map.h"
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 68 matching lines @@
   scoped_ptr<ContentSettingImageModel> content_setting_image_model(
      ContentSettingImageModel::CreateContentSettingImageModel(
          CONTENT_SETTINGS_TYPE_PROTOCOL_HANDLERS));
   content_setting_image_model->UpdateFromWebContents(web_contents());
   EXPECT_FALSE(content_setting_image_model->is_visible());
 
   TabSpecificContentSettings* content_settings =
       TabSpecificContentSettings::FromWebContents(web_contents());
   content_settings->set_pending_protocol_handler(
       ProtocolHandler::CreateProtocolHandler(
-          "mailto", GURL("http://www.google.com/"), ASCIIToUTF16("Handler")));
+          "mailto", GURL("http://www.google.com/"),
+          base::ASCIIToUTF16("Handler")));
   content_setting_image_model->UpdateFromWebContents(web_contents());
   EXPECT_TRUE(content_setting_image_model->is_visible());
 }
 
 TEST_F(ContentSettingImageModelTest, CookieAccessed) {
   TabSpecificContentSettings::CreateForWebContents(web_contents());
   TabSpecificContentSettings* content_settings =
       TabSpecificContentSettings::FromWebContents(web_contents());
   profile()->GetHostContentSettingsMap()->SetDefaultContentSetting(
       CONTENT_SETTINGS_TYPE_COOKIES, CONTENT_SETTING_BLOCK);
@@ skipping 21 matching lines @@
   scoped_ptr<ContentSettingImageModel> content_setting_image_model(
      ContentSettingImageModel::CreateContentSettingImageModel(
          CONTENT_SETTINGS_TYPE_IMAGES));
   NotificationForwarder forwarder(content_setting_image_model.get());
   // Should not crash.
   TabSpecificContentSettings::CreateForWebContents(web_contents());
   forwarder.clear();
 }
 
 }  // namespace