Make DETECT_IMPORTANT_CONTENT the default Plugins content setting based

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 1985 matching lines @@
       'browser/plugins/plugin_metadata.cc',
       'browser/plugins/plugin_metadata.h',
       'browser/plugins/plugin_observer.cc',
       'browser/plugins/plugin_observer.h',
       'browser/plugins/plugin_prefs.cc',
       'browser/plugins/plugin_prefs.h',
       'browser/plugins/plugin_prefs_factory.cc',
       'browser/plugins/plugin_prefs_factory.h',
       'browser/plugins/plugin_status_pref_setter.cc',
       'browser/plugins/plugin_status_pref_setter.h',
-      'browser/plugins/plugins_field_trial.cc',
-      'browser/plugins/plugins_field_trial.h',
       'browser/renderer_host/pepper/chrome_browser_pepper_host_factory.cc',
       'browser/renderer_host/pepper/chrome_browser_pepper_host_factory.h',
       'browser/renderer_host/pepper/device_id_fetcher.cc',
       'browser/renderer_host/pepper/device_id_fetcher.h',
       'browser/renderer_host/pepper/monitor_finder_mac.h',
       'browser/renderer_host/pepper/monitor_finder_mac.mm',
       'browser/renderer_host/pepper/pepper_broker_message_filter.cc',
       'browser/renderer_host/pepper/pepper_broker_message_filter.h',
       'browser/renderer_host/pepper/pepper_flash_browser_host.cc',
       'browser/renderer_host/pepper/pepper_flash_browser_host.h',
@@ skipping 1083 matching lines @@
             '../components/components.gyp:autofill_content_browser',
             '../components/components.gyp:browsing_data',
             '../components/components.gyp:data_reduction_proxy_content_browser',
             '../components/components.gyp:dom_distiller_content',
             '../components/components.gyp:favicon_content',
             '../components/components.gyp:history_content_browser',
             '../components/components.gyp:keyed_service_content',
             '../components/components.gyp:navigation_interception',
             '../components/components.gyp:packed_ct_ev_whitelist',
             '../components/components.gyp:password_manager_content_browser',
+            '../components/components.gyp:plugins_common',
             '../components/components.gyp:power',
             '../components/components.gyp:precache_content',
             '../components/components.gyp:sessions_content',
             '../components/components.gyp:storage_monitor',
             '../components/components.gyp:translate_content_browser',
             '../components/components.gyp:url_matcher',
             '../components/components.gyp:visitedlink_browser',
             '../components/components.gyp:visitedlink_common',
             '../components/components.gyp:web_cache_browser',
             '../components/components.gyp:web_modal',
@@ skipping 725 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' ]
         },
       ],
     },],
   ],
 }