Move CrTrackingArea from chrome/browser/ui/cocoa to ui/base/cocoa.

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 791 matching lines @@
         'browser/ui/cocoa/toolbar/back_forward_menu_controller.h',
         'browser/ui/cocoa/toolbar/back_forward_menu_controller.mm',
         'browser/ui/cocoa/toolbar/reload_button.h',
         'browser/ui/cocoa/toolbar/reload_button.mm',
         'browser/ui/cocoa/toolbar/toolbar_button.h',
         'browser/ui/cocoa/toolbar/toolbar_button.mm',
         'browser/ui/cocoa/toolbar/toolbar_controller.h',
         'browser/ui/cocoa/toolbar/toolbar_controller.mm',
         'browser/ui/cocoa/toolbar/toolbar_view.h',
         'browser/ui/cocoa/toolbar/toolbar_view.mm',
-        'browser/ui/cocoa/tracking_area.h',
-        'browser/ui/cocoa/tracking_area.mm',
         'browser/ui/cocoa/ui_localizer.h',
         'browser/ui/cocoa/ui_localizer.mm',
         'browser/ui/cocoa/url_drop_target.h',
         'browser/ui/cocoa/url_drop_target.mm',
         'browser/ui/cocoa/vertical_gradient_view.h',
         'browser/ui/cocoa/vertical_gradient_view.mm',
         'browser/ui/cocoa/view_id_util.h',
         'browser/ui/cocoa/view_id_util.mm',
         'browser/ui/cocoa/view_resizer.h',
         'browser/ui/cocoa/web_contents_modal_dialog_manager_cocoa.mm',
@@ skipping 2032 matching lines @@
         }],
         ['enable_message_center==1', {
           'dependencies': [
             '../ui/message_center/message_center.gyp:message_center',
           ],
         }],
       ],
     },
   ],
 }