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

chrome/browser/ui/cocoa/bookmarks/bookmark_button_cell_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.
 
 #include "base/mac/scoped_nsobject.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_button_cell.h"
 #include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
@@ skipping 141 matching lines @@
       [[BookmarkButtonCell alloc] init]);
   [cell awakeFromNib];
   EXPECT_EQ(NSLeftTextAlignment, [cell alignment]);
 }
 
 // Subfolder arrow details.
 TEST_F(BookmarkButtonCellTest, FolderArrow) {
   BookmarkModel* model = BookmarkModelFactory::GetForProfile(profile());
   const BookmarkNode* bar = model->bookmark_bar_node();
   const BookmarkNode* node = model->AddURL(bar, bar->child_count(),
-                                           ASCIIToUTF16("title"),
+                                           base::ASCIIToUTF16("title"),
                                            GURL("http://www.google.com"));
   base::scoped_nsobject<BookmarkButtonCell> cell(
       [[BookmarkButtonCell alloc] initForNode:node
                                          text:@"small"
                                         image:nil
                                menuController:nil]);
   EXPECT_TRUE(cell.get());
 
   NSSize size = [cell cellSize];
   // sanity check
   EXPECT_GE(size.width, 2);
   EXPECT_GE(size.height, 2);
 
   // Once we turn on arrow drawing make sure there is now room for it.
   [cell setDrawFolderArrow:YES];
   NSSize arrowSize = [cell cellSize];
   EXPECT_GT(arrowSize.width, size.width);
 }
 
 TEST_F(BookmarkButtonCellTest, VerticalTextOffset) {
   BookmarkModel* model = BookmarkModelFactory::GetForProfile(profile());
   const BookmarkNode* bar = model->bookmark_bar_node();
   const BookmarkNode* node = model->AddURL(bar, bar->child_count(),
-                                           ASCIIToUTF16("title"),
+                                           base::ASCIIToUTF16("title"),
                                            GURL("http://www.google.com"));
 
   base::scoped_nsobject<GradientButtonCell> gradient_cell(
       [[GradientButtonCell alloc] initTextCell:@"Testing"]);
   base::scoped_nsobject<BookmarkButtonCell> bookmark_cell(
       [[BookmarkButtonCell alloc] initForNode:node
                                          text:@"small"
                                         image:nil
                                menuController:nil]);
 
   ASSERT_TRUE(gradient_cell.get());
   ASSERT_TRUE(bookmark_cell.get());
 
   EXPECT_EQ(1, [gradient_cell verticalTextOffset]);
   EXPECT_EQ(0, [bookmark_cell verticalTextOffset]);
 
   EXPECT_NE([bookmark_cell verticalTextOffset],
             [gradient_cell verticalTextOffset]);
 }
 
 }  // namespace