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

webkit/plugins/npapi/webplugin_delegate_impl_win.cc

 // 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.
 
 #include "webkit/plugins/npapi/webplugin_delegate_impl.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 11 matching lines @@
 #include "base/win/registry.h"
 #include "base/win/windows_version.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/base/win/dpi.h"
 #include "ui/base/win/hwnd_util.h"
 #include "webkit/common/cursors/webcursor.h"
 #include "webkit/plugins/npapi/plugin_constants_win.h"
 #include "webkit/plugins/npapi/plugin_instance.h"
 #include "webkit/plugins/npapi/plugin_lib.h"
-#include "webkit/plugins/npapi/plugin_list.h"
 #include "webkit/plugins/npapi/plugin_stream_url.h"
 #include "webkit/plugins/npapi/plugin_utils.h"
 #include "webkit/plugins/npapi/webplugin.h"
 #include "webkit/plugins/npapi/webplugin_ime_win.h"
 #include "webkit/plugins/plugin_constants.h"
 
 using WebKit::WebKeyboardEvent;
 using WebKit::WebInputEvent;
 using WebKit::WebMouseEvent;
 
@@ skipping 1498 matching lines @@
       ::ReleaseCapture();
       break;
 
     default:
       break;
   }
 }
 
 }  // namespace npapi
 }  // namespace webkit