Make it clear what last_sync_timestamp actually tracks. Update

chrome/browser/cocoa/preferences_window_controller.h

 // Copyright (c) 2009 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/scoped_ptr.h"
 #include "base/scoped_nsobject.h"
 #include "chrome/browser/options_window.h"
 #include "chrome/browser/pref_member.h"
 
 namespace PreferencesWindowControllerInternal {
 class PersonalDataManagerObserver;
 class PrefObserverBridge;
 }
 
 @class CustomHomePagesModel;
 @class FontLanguageSettingsController;
 class PrefService;
 class Profile;
 class ProfileSyncService;
 @class SearchEngineListModel;
 
 // A window controller that handles the preferences window. The bulk of the
 // work is handled via Cocoa Bindings and getter/setter methods that wrap
 // cross-platform PrefMember objects. When prefs change in the back-end
-// (that is, outside of this UI), our observer recieves a notification and can
+// (that is, outside of this UI), our observer receives a notification and can
 // tickle the KVO to update the UI so we are always in sync. The bindings are
 // specified in the nib file. Preferences are persisted into the back-end
 // as they are changed in the UI, and are thus immediately available even while
 // the window is still open. When the window closes, a notification is sent
 // via the system NotificationCenter. This can be used as a signal to
 // release this controller, as it's likely the client wants to enforce there
 // only being one (we don't do that internally as it makes it very difficult
 // to unit test).
 @interface PreferencesWindowController : NSWindowController {
  @private
@@ skipping 140 matching lines @@
 // Returns the (normalized) page corresponding to the given toolbar item.
 // Should be called only after awakeFromNib is.
 - (OptionsPage)getPageForToolbarItem:(NSToolbarItem*)toolbarItem;
 
 // Returns the view corresponding to the given page.  Should be called
 // only after awakeFromNib is.
 - (NSView*)getPrefsViewForPage:(OptionsPage)page;
 
 @end