The chrome browser target should not depend on plugins.

webkit/plugins/webkit_plugins.gypi

 # Copyright (c) 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': [
     {
       'target_name': 'plugins_common',
       'type': 'static_library',
       'defines': [
@@ skipping 21 matching lines @@
         '../plugins/plugin_switches.h',
         '../plugins/npapi/plugin_constants_win.cc',
         '../plugins/npapi/plugin_constants_win.h',
         '../plugins/npapi/plugin_list.cc',
         '../plugins/npapi/plugin_list.h',
         '../plugins/npapi/plugin_list_mac.mm',
         '../plugins/npapi/plugin_list_posix.cc',
         '../plugins/npapi/plugin_list_win.cc',
         '../plugins/npapi/plugin_utils.cc',
         '../plugins/npapi/plugin_utils.h',
+        '../common/plugins/ppapi/ppapi_utils.cc',
+        '../common/plugins/ppapi/ppapi_utils.h',
       ],
       'conditions': [
         ['toolkit_uses_gtk == 1', {
           'dependencies': [
             '<(DEPTH)/build/linux/system.gyp:gtk',
           ],
           'sources/': [['exclude', '_x11\\.cc$']],
         }],
         ['OS!="mac"', {
           'sources/': [['exclude', '_mac\\.(cc|mm)$']],
@@ skipping 232 matching lines @@
             '<(DEPTH)/third_party/wtl/include',
           ],
           'sources!': [
             'plugins/plugin_stubs.cc',
           ],
         }],
       ],
     }
   ],
 }