Suppress native app install banner if the site has a manifest.

chrome/chrome_browser.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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 80 matching lines @@
       'browser/android/feature_utilities.cc',
       'browser/android/feature_utilities.h',
       'browser/android/find_in_page/find_in_page_bridge.cc',
       'browser/android/find_in_page/find_in_page_bridge.h',
       'browser/android/foreign_session_helper.cc',
       'browser/android/foreign_session_helper.h',
       'browser/android/logo_bridge.cc',
       'browser/android/logo_bridge.h',
       'browser/android/logo_service.cc',
       'browser/android/logo_service.h',
-      'browser/android/meta_tag_observer.cc',
-      'browser/android/meta_tag_observer.h',
       'browser/android/new_tab_page_prefs.cc',
       'browser/android/new_tab_page_prefs.h',
       'browser/android/new_tab_page_url_handler.cc',
       'browser/android/new_tab_page_url_handler.h',
       'browser/android/intent_helper.cc',
       'browser/android/intent_helper.h',
       'browser/android/intercept_download_resource_throttle.cc',
       'browser/android/intercept_download_resource_throttle.h',
       'browser/android/location_settings.h',
       'browser/android/location_settings_impl.cc',
@@ skipping 3570 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }