Exclude PluginService for builds with enable_plugins==0

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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2346 matching lines @@
         }],
         ['enable_plugins==1', {
           'dependencies': [
             '../ppapi/ppapi_internal.gyp:ppapi_ipc',
           ],
         }, {  # enable_plugins==0
           'sources/': [
             ['exclude', '^browser/pepper_'],
             ['exclude', '^browser/renderer_host/pepper/'],
           ],
+          'sources!': [
+            'browser/plugins/plugin_observer.cc',
+            'browser/plugins/plugin_observer.h',
+            'browser/renderer_host/plugin_info_message_filter.cc',
+            'browser/renderer_host/plugin_info_message_filter.h',
+          ],
         }],
         ['safe_browsing==1', {
           'defines': [
             'FULL_SAFE_BROWSING',
           ],
         }],
         ['safe_browsing==2', {
           'defines': [
             'MOBILE_SAFE_BROWSING',
           ],
@@ skipping 728 matching lines @@
             'proto_in_dir': '../third_party/cros_system_api/dbus',
             'proto_out_dir': 'chrome/browser/media_transfer_protocol',
           },
           'includes': ['../build/protoc.gypi'],
         },
       ],
      },
     ],
   ],
 }