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

chrome/browser/ui/bookmarks/bookmark_editor_unittest.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/ui/bookmarks/bookmark_editor.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using base::ASCIIToUTF16;
+
 namespace {
 
 TEST(BookmarkEditorTest, ApplyEditsWithNoFolderChange) {
   BookmarkModel model(NULL);
   const BookmarkNode* bookmarkbar = model.bookmark_bar_node();
   model.AddURL(bookmarkbar, 0, ASCIIToUTF16("url0"), GURL("chrome://newtab"));
   model.AddURL(bookmarkbar, 1, ASCIIToUTF16("url1"), GURL("chrome://newtab"));
 
   {
     BookmarkEditor::EditDetails detail(
@@ skipping 21 matching lines @@
     BookmarkEditor::ApplyEditsWithNoFolderChange(&model,
                                                  bookmarkbar,
                                                  detail,
                                                  ASCIIToUTF16("folder2"),
                                                  GURL(std::string()));
     EXPECT_EQ(ASCIIToUTF16("folder2"), bookmarkbar->GetChild(4)->GetTitle());
   }
 }
 
 }  // namespace