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

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_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/basictypes.h"
 #include "base/command_line.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/string16.h"
@@ skipping 20 matching lines @@
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 #import "third_party/ocmock/OCMock/OCMock.h"
 #include "third_party/ocmock/gtest_support.h"
 #include "ui/base/cocoa/animation_utils.h"
 #include "ui/base/test/cocoa_test_event_utils.h"
 #include "ui/base/theme_provider.h"
 #include "ui/gfx/image/image_skia.h"
 
+using base::ASCIIToUTF16;
+
 // Unit tests don't need time-consuming asynchronous animations.
 @interface BookmarkBarControllerTestable : BookmarkBarController {
 }
 
 @end
 
 @implementation BookmarkBarControllerTestable
 
 - (id)initWithBrowser:(Browser*)browser
          initialWidth:(CGFloat)initialWidth
@@ skipping 2018 matching lines @@
                              "2f3b ] 4b ");
   actual = test::ModelStringFromNode(root);
   EXPECT_EQ(expected, actual);
 
   // Verify that the other bookmark folder can't be deleted.
   BookmarkButton *otherButton = [bar_ otherBookmarksButton];
   EXPECT_FALSE([bar_ canDragBookmarkButtonToTrash:otherButton]);
 }
 
 }  // namespace