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

chrome/chrome_tests_unit.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': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 1289 matching lines @@
         'browser/ui/cocoa/first_run_bubble_controller_unittest.mm',
         'browser/ui/cocoa/floating_bar_backing_view_unittest.mm',
         'browser/ui/cocoa/framed_browser_window_unittest.mm',
         'browser/ui/cocoa/fullscreen_window_unittest.mm',
         'browser/ui/cocoa/fullscreen_exit_bubble_controller_unittest.mm',
         'browser/ui/cocoa/gradient_button_cell_unittest.mm',
         'browser/ui/cocoa/history_menu_bridge_unittest.mm',
         'browser/ui/cocoa/history_menu_cocoa_controller_unittest.mm',
         'browser/ui/cocoa/history_overlay_controller_unittest.mm',
         'browser/ui/cocoa/hover_close_button_unittest.mm',
-        'browser/ui/cocoa/hover_image_button_unittest.mm',
         'browser/ui/cocoa/hung_renderer_controller_unittest.mm',
         'browser/ui/cocoa/hyperlink_button_cell_unittest.mm',
         'browser/ui/cocoa/hyperlink_text_view_unittest.mm',
         'browser/ui/cocoa/image_button_cell_unittest.mm',
         'browser/ui/cocoa/info_bubble_view_unittest.mm',
         'browser/ui/cocoa/info_bubble_window_unittest.mm',
         'browser/ui/cocoa/infobars/confirm_infobar_controller_unittest.mm',
         'browser/ui/cocoa/infobars/infobar_container_controller_unittest.mm',
         'browser/ui/cocoa/infobars/infobar_gradient_view_unittest.mm',
         'browser/ui/cocoa/infobars/translate_infobar_unittest.mm',
@@ skipping 1095 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }