Move HoverButton and HoverImageButton from chrome/browser/ui/cocoa/ to ui/base/cocoa.

ui/ui_unittests.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'ui_test_support',
       'type': 'static_library',
       'dependencies': [
@@ skipping 94 matching lines @@
       ],
       'all_sources': [
         '<@(_common_sources)',
         'base/accelerators/accelerator_manager_unittest.cc',
         'base/clipboard/clipboard_unittest.cc',
         'base/clipboard/custom_data_helper_unittest.cc',
         'base/cocoa/base_view_unittest.mm',
         'base/cocoa/events_mac_unittest.mm',
         'base/cocoa/focus_tracker_unittest.mm',
         'base/cocoa/fullscreen_window_manager_unittest.mm',
+        'base/cocoa/hover_image_button_unittest.mm',
         'base/cocoa/tracking_area_unittest.mm',
         'base/events/event_dispatcher_unittest.cc',
         'base/events/event_unittest.cc',
         'base/gtk/gtk_expanded_container_unittest.cc',
         'base/gtk/gtk_im_context_util_unittest.cc',
         'base/gtk/menu_label_accelerator_util_unittest.cc',
         'base/keycodes/usb_keycode_map_unittest.cc',
         'base/models/list_model_unittest.cc',
         'base/models/list_selection_model_unittest.cc',
         'base/models/tree_node_model_unittest.cc',
@@ skipping 181 matching lines @@
           'variables': {
             'test_suite_name': 'ui_unittests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)ui_unittests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }