[Extensions] Propagate activeTab hosts to extension background pages

chrome/chrome_renderer.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.
 
 {
   'variables': {
     'chrome_renderer_sources': [
       'renderer/benchmarking_extension.cc',
       'renderer/benchmarking_extension.h',
       'renderer/isolated_world_ids.h',
@@ skipping 98 matching lines @@
       'renderer/extensions/page_capture_custom_bindings.cc',
       'renderer/extensions/page_capture_custom_bindings.h',
       'renderer/extensions/platform_keys_natives.cc',
       'renderer/extensions/platform_keys_natives.h',
       'renderer/extensions/renderer_permissions_policy_delegate.cc',
       'renderer/extensions/renderer_permissions_policy_delegate.h',
       'renderer/extensions/resource_request_policy.cc',
       'renderer/extensions/resource_request_policy.h',
       'renderer/extensions/sync_file_system_custom_bindings.cc',
       'renderer/extensions/sync_file_system_custom_bindings.h',
-      'renderer/extensions/tab_finder.cc',
-      'renderer/extensions/tab_finder.h',
       'renderer/extensions/tabs_custom_bindings.cc',
       'renderer/extensions/tabs_custom_bindings.h',
       'renderer/extensions/webstore_bindings.cc',
       'renderer/extensions/webstore_bindings.h',
       'renderer/media/cast_rtp_stream.cc',
       'renderer/media/cast_rtp_stream.h',
       'renderer/media/cast_ipc_dispatcher.cc',
       'renderer/media/cast_ipc_dispatcher.h',
       'renderer/media/cast_session.cc',
       'renderer/media/cast_session.h',
@@ skipping 265 matching lines @@
               'export_dependent_settings': [
                 '<(allocator_target)',
               ],
             }],
           ],
         }],
       ],
     },
   ],
 }