Move audio focus control from media/ to content/ and make it per WebContents.

content/content_tests.gypi

 # Copyright (c) 2013 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': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 201 matching lines @@
       'browser/frame_host/navigation_controller_impl_browsertest.cc',
       'browser/frame_host/render_frame_host_impl_browsertest.cc',
       'browser/frame_host/render_frame_host_manager_browsertest.cc',
       'browser/gpu/gpu_ipc_browsertests.cc',
       'browser/host_zoom_map_impl_browsertest.cc',
       'browser/indexed_db/indexed_db_browsertest.cc',
       'browser/indexed_db/mock_browsertest_indexed_db_class_factory.cc',
       'browser/indexed_db/mock_browsertest_indexed_db_class_factory.h',
       'browser/loader/resource_dispatcher_host_browsertest.cc',
       'browser/manifest/manifest_browsertest.cc',
+      'browser/media/android/media_session_browsertest.cc',
       'browser/media/encrypted_media_browsertest.cc',
       'browser/media/media_browsertest.cc',
       'browser/media/media_browsertest.h',
       'browser/media/media_canplaytype_browsertest.cc',
       'browser/media/media_source_browsertest.cc',
       'browser/message_port_provider_browsertest.cc',
       'browser/net_info_browsertest.cc',
       'browser/plugin_browsertest.cc',
       'browser/renderer_host/input/touch_action_browsertest.cc',
       'browser/renderer_host/input/touch_input_browsertest.cc',
@@ skipping 1918 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }