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

content/browser/plugin_service_impl.cc

Index: content/browser/plugin_service_impl.cc
===================================================================
--- content/browser/plugin_service_impl.cc	(revision 211642)
+++ content/browser/plugin_service_impl.cc	(working copy)
@@ -68,8 +68,7 @@
   // that causes instability.
 
   // Can't load the plugins on the utility thread when in single process mode
-  // since that requires using WebKit and GTK and they can only be used on the
-  // main thread.
+  // since that requires GTK which can only be used on the main thread.
   if (RenderProcessHost::run_renderer_in_process())
     return true;
 
@@ -193,8 +192,6 @@
     RegisterInternalPlugin(webview_plugin, true);
   }
 
-  GetContentClient()->AddNPAPIPlugins(plugin_list_);
-
   // Load any specified on the command line as well.
   base::FilePath path =
       command_line->GetSwitchValuePath(switches::kLoadPlugin);