Move BookmarkExpandedStateTracker into bookmarks namespace.

chrome/browser/ui/cocoa/bookmarks/bookmark_editor_controller.mm

 // Copyright (c) 2011 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 "chrome/browser/ui/cocoa/bookmarks/bookmark_editor_controller.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/strings/string16.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/bookmarks/bookmark_utils.h"
 #include "components/bookmarks/browser/bookmark_expanded_state_tracker.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/url_fixer/url_fixer.h"
 #include "components/user_prefs/user_prefs.h"
 #include "ui/base/l10n/l10n_util.h"
 
+using bookmarks::BookmarkExpandedStateTracker;
+
 @interface BookmarkEditorController (Private)
 
 // Grab the url from the text field and convert.
 - (GURL)GURLFromUrlField;
 
 @end
 
 @implementation BookmarkEditorController
 
 @synthesize displayURL = displayURL_;
@@ skipping 134 matching lines @@
       SetExpandedNodes(expanded_nodes);
   return [NSNumber numberWithBool:YES];
 }
 
 - (NSColor *)urlFieldColor {
   return [urlField_ backgroundColor];
 }
 
 @end  // BookmarkEditorController