Plugin Power Saver: remove dead flags

components/plugins.gypi

 # Copyright 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.
 
 {
-  'targets': [
-    {
-      # GN version: //components/plugins/common
-      'target_name': 'plugins_common',
-      'type': 'static_library',
-      'include_dirs': [
-        '..',
-      ],
-      'sources': [
-        'plugins/common/plugins_switches.cc',
-        'plugins/common/plugins_switches.h',
-      ],
-    },
-  ],
   'conditions': [
     ['OS!="ios"', {
       'targets': [
         {
           # GN version: //components/plugins/renderer
           'target_name': 'plugins_renderer',
           'type': 'static_library',
           'dependencies': [
             '../gin/gin.gyp:gin',
             '../skia/skia.gyp:skia',
@@ skipping 25 matching lines @@
                 'plugins/renderer/mobile_youtube_plugin.cc',
                 'plugins/renderer/mobile_youtube_plugin.h',
               ]
             }],
           ],
         },
       ],
     }],
   ],
 }