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

chrome/browser/ui/cocoa/bookmarks/bookmark_editor_base_controller_unittest.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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_editor_controller.h"
 #include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
 #include "chrome/test/base/test_browser_window.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_mac.h"
 
+using base::ASCIIToUTF16;
+
 class BookmarkEditorBaseControllerTest : public CocoaProfileTest {
  public:
   BookmarkEditorBaseController* controller_;  // weak
   const BookmarkNode* folder_a_;
   const BookmarkNode* folder_b_;
   const BookmarkNode* folder_b_0_;
   const BookmarkNode* folder_b_3_;
   const BookmarkNode* folder_c_;
 
   void CreateModel() {
@@ skipping 234 matching lines @@
       reinterpret_cast<const BookmarkNode*>(&children);
   BookmarkFolderInfo* info =
     [BookmarkFolderInfo bookmarkFolderInfoWithFolderName:@"name"
                                               folderNode:fakeNode
                                                 children:children];
   EXPECT_TRUE(info);
   EXPECT_EQ([info folderName], @"name");
   EXPECT_EQ([info children], children);
   EXPECT_EQ([info folderNode], fakeNode);
 }