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

chrome/browser/ui/cocoa/bookmarks/bookmark_editor_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/string16.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/testing_profile.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
+using base::ASCIIToUTF16;
+
 class BookmarkEditorControllerTest : public CocoaProfileTest {
  public:
   const BookmarkNode* default_node_;
   const BookmarkNode* default_parent_;
   const char* default_name_;
   base::string16 default_title_;
   BookmarkEditorController* controller_;
 
   virtual void SetUp() OVERRIDE {
     CocoaProfileTest::SetUp();
@@ skipping 441 matching lines @@
 
 TEST_F(BookmarkEditorControllerTreeNoNodeTest, NewBookmarkNoNode) {
   [controller_ setDisplayName:@"NEW BOOKMARK"];
   [controller_ setDisplayURL:@"http://NEWURL.com"];
   [controller_ ok:nil];
   const BookmarkNode* new_node = folder_bb_->GetChild(5);
   ASSERT_EQ(0, new_node->child_count());
   EXPECT_EQ(new_node->GetTitle(), ASCIIToUTF16("NEW BOOKMARK"));
   EXPECT_EQ(new_node->url(), GURL("http://NEWURL.com"));
 }