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

chrome/browser/ui/cocoa/view_id_util_browsertest.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.
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
@@ skipping 44 matching lines @@
     browser()->window()->GetDownloadShelf()->Show();
 
     // Create a bookmark to test VIEW_ID_BOOKMARK_BAR_ELEMENT
     BookmarkModel* bookmark_model =
         BookmarkModelFactory::GetForProfile(browser()->profile());
     if (bookmark_model) {
       if (!bookmark_model->loaded())
         test::WaitForBookmarkModelToLoad(bookmark_model);
 
       bookmark_utils::AddIfNotBookmarked(
-          bookmark_model, GURL(content::kAboutBlankURL), ASCIIToUTF16("about"));
+          bookmark_model, GURL(content::kAboutBlankURL),
+          base::ASCIIToUTF16("about"));
     }
 
     for (int i = VIEW_ID_TOOLBAR; i < VIEW_ID_PREDEFINED_COUNT; ++i) {
       // Mac implementation does not support following ids yet.
       if (i == VIEW_ID_STAR_BUTTON ||
           i == VIEW_ID_CONTENTS_SPLIT ||
           i == VIEW_ID_FEEDBACK_BUTTON ||
           i == VIEW_ID_SCRIPT_BUBBLE ||
           i == VIEW_ID_MIC_SEARCH_BUTTON ||
           i == VIEW_ID_TRANSLATE_BUTTON) {
@@ skipping 37 matching lines @@
     // VIEW_ID_TAB_LAST should always be available.
     CheckViewID(VIEW_ID_TAB_LAST, true);
   }
 
   // Open the 11th tab.
   browser()->OpenURL(OpenURLParams(
       GURL(content::kAboutBlankURL), Referrer(), NEW_BACKGROUND_TAB,
       content::PAGE_TRANSITION_TYPED, false));
   CheckViewID(VIEW_ID_TAB_LAST, true);
 }