Remove unused includes of plugin_list.h. Also remove unused ContentClient and webkit_support method…

webkit/support/webkit_support.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 44 matching lines @@
         'gc_extension.h',
         'platform_support.h',
         'platform_support_android.cc',
         'platform_support_linux.cc',
         'platform_support_mac.mm',
         'platform_support_win.cc',
         'test_webkit_platform_support.cc',
         'test_webkit_platform_support.h',
         'test_webmessageportchannel.cc',
         'test_webmessageportchannel.h',
-        'test_webplugin_page_delegate.cc',
-        'test_webplugin_page_delegate.h',
         'webkit_support.cc',
         'webkit_support.h',
         'webkit_support_glue.cc',
         'weburl_loader_mock.cc',
         'weburl_loader_mock.h',
         'weburl_loader_mock_factory.cc',
         'weburl_loader_mock_factory.h',
         'web_audio_device_mock.cc',
         'web_audio_device_mock.h',
         'web_gesture_curve_mock.cc',
@@ skipping 80 matching lines @@
         '<(DEPTH)',
       ],
       'conditions': [
           ['OS=="android"', {
               'toolsets': ['target', 'host'],
           }],
       ],
     },
   ],
 }