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

chrome/browser/ui/cocoa/bookmarks/bookmark_name_folder_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/mac/scoped_nsobject.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_name_folder_controller.h"
 #include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
 #include "chrome/test/base/testing_profile.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
+using base::ASCIIToUTF16;
+
 class BookmarkNameFolderControllerTest : public CocoaProfileTest {
 };
 
 
 // Simple add of a node (at the end).
 TEST_F(BookmarkNameFolderControllerTest, AddNew) {
   BookmarkModel* model = BookmarkModelFactory::GetForProfile(profile());
   const BookmarkNode* parent = model->bookmark_bar_node();
   EXPECT_EQ(0, parent->child_count());
 
@@ skipping 129 matching lines @@
 
   [controller setFolderName:@"Bozo"];
   EXPECT_TRUE([[controller okButton] isEnabled]);
   [controller setFolderName:@" "];
   EXPECT_TRUE([[controller okButton] isEnabled]);
 
   [controller setFolderName:@""];
   EXPECT_TRUE([[controller okButton] isEnabled]);
 }