Exclude PluginService for builds with enable_plugins==0

content/content_common.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../build/temp_gyp/googleurl.gyp:googleurl',
     '../media/media.gyp:media',
     '../net/net.gyp:net',
@@ skipping 457 matching lines @@
     ['use_x11 == 1 and (target_arch != "arm" or chromeos == 0)', {
       'sources': [
         'common/gpu/x_util.cc',
         'common/gpu/x_util.h',
       ],
     }],
     ['enable_plugins==1', {
       'dependencies': [
         '../ppapi/ppapi_internal.gyp:ppapi_shared',
       ],
+    }, {  # enable_plugins == 0
+      'sources!': [
+        'common/pepper_plugin_registry.cc',
+        'common/pepper_plugin_registry.h',
+      ],
     }],
     ['enable_gpu==1', {
       'dependencies': [
         '../gpu/gpu.gyp:command_buffer_service',
       ],
     }],
     ['target_arch=="arm" and chromeos == 1', {
       'dependencies': [
         '../media/media.gyp:media',
       ],
@@ skipping 83 matching lines @@
         '../build/extract_from_cab.py',
         '..\\third_party\\directxsdk\\files\\Redist\\<(input)',
         '<(output)',
         '<(PRODUCT_DIR)',
         ],
       },
      ]
     }],
   ],
 }