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

chrome/browser/ui/cocoa/bookmarks/bookmark_menu_bridge_unittest.mm

 // Copyright (c) 2011 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.
 
 #import <AppKit/AppKit.h>
 
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/ui/cocoa/bookmarks/bookmark_menu_bridge.h"
 #include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
 #include "chrome/test/base/testing_profile.h"
 #include "grit/generated_resources.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 #include "ui/base/l10n/l10n_util.h"
 
+using base::ASCIIToUTF16;
+
 class TestBookmarkMenuBridge : public BookmarkMenuBridge {
  public:
   TestBookmarkMenuBridge(Profile* profile, NSMenu *menu)
       : BookmarkMenuBridge(profile, menu),
         menu_(menu) {
   }
   virtual ~TestBookmarkMenuBridge() {
     [menu_ autorelease];
   }
 
@@ skipping 362 matching lines @@
   EXPECT_TRUE([item image]);
 
   model->SetTitle(node, ASCIIToUTF16("New Title"));
 
   item = [menu itemWithTitle:@"Test Item"];
   EXPECT_FALSE(item);
   item = [menu itemWithTitle:@"New Title"];
   EXPECT_TRUE(item);
 }