[Cocoa] Tab audio mute control, behind a switch (off by default).

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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       '../apps/saved_files_service_unittest.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.h',
       '../components/autofill/content/renderer/test_password_generation_agent.cc',
@@ skipping 1084 matching lines @@
       'browser/ui/cocoa/sprite_view_unittest.mm',
       'browser/ui/cocoa/status_bubble_mac_unittest.mm',
       'browser/ui/cocoa/status_icons/status_icon_mac_unittest.mm',
       'browser/ui/cocoa/styled_text_field_cell_unittest.mm',
       'browser/ui/cocoa/styled_text_field_test_helper.h',
       'browser/ui/cocoa/styled_text_field_test_helper.mm',
       'browser/ui/cocoa/styled_text_field_unittest.mm',
       'browser/ui/cocoa/tab_contents/sad_tab_controller_unittest.mm',
       'browser/ui/cocoa/tab_contents/sad_tab_view_unittest.mm',
       'browser/ui/cocoa/table_row_nsimage_cache_unittest.mm',
-      'browser/ui/cocoa/tabs/media_indicator_view_unittest.mm',
+      'browser/ui/cocoa/tabs/media_indicator_button_unittest.mm',
       'browser/ui/cocoa/tabs/tab_controller_unittest.mm',
       'browser/ui/cocoa/tabs/tab_strip_controller_unittest.mm',
       'browser/ui/cocoa/tabs/tab_strip_view_unittest.mm',
       'browser/ui/cocoa/tabs/tab_view_unittest.mm',
       'browser/ui/cocoa/task_manager_mac_unittest.mm',
       'browser/ui/cocoa/toolbar/reload_button_unittest.mm',
       'browser/ui/cocoa/toolbar/toolbar_button_unittest.mm',
       'browser/ui/cocoa/toolbar/toolbar_controller_unittest.mm',
       'browser/ui/cocoa/toolbar/toolbar_view_unittest.mm',
       'browser/ui/cocoa/toolbar/wrench_toolbar_button_cell_unittest.mm',
@@ skipping 1788 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }