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

chrome/browser/ui/cocoa/bookmarks/bookmark_all_tabs_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_all_tabs_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"
 #include "testing/platform_test.h"
 
+using base::ASCIIToUTF16;
+
 @interface BookmarkAllTabsControllerOverride : BookmarkAllTabsController
 @end
 
 @implementation BookmarkAllTabsControllerOverride
 
 - (void)UpdateActiveTabPairs {
   ActiveTabsNameURLPairVector* activeTabPairsVector =
       [self activeTabPairsVector];
   activeTabPairsVector->clear();
   activeTabPairsVector->push_back(
@@ skipping 50 matching lines @@
   // OK button should always be enabled.
   EXPECT_TRUE([controller_ okButtonEnabled]);
   [controller_ selectTestNodeInBrowser:folder_a_];
   [controller_ setDisplayName:@"ALL MY TABS"];
   [controller_ ok:nil];
   EXPECT_EQ(4, folder_a_->child_count());
   const BookmarkNode* folderChild = folder_a_->GetChild(3);
   EXPECT_EQ(folderChild->GetTitle(), ASCIIToUTF16("ALL MY TABS"));
   EXPECT_EQ(3, folderChild->child_count());
 }