Add PluginServiceStub for builds with enable_plugins==0

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 677bc0d75f3d96eb839764aa112803d2a6fef4cb..41b956efb8ee3ed5e7761105ec1ab793ecbb7e48 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -491,10 +491,15 @@ void RenderProcessHostImpl::CreateMessageFilters() {
     channel_->AddFilter(bp_message_filter);
   }
 
+  PluginServiceImpl* plugin_service = NULL;
+#if defined(ENABLE_PLUGINS)
+  plugin_service = PluginServiceImpl::GetInstance();
+#endif
+
   scoped_refptr<RenderMessageFilter> render_message_filter(
       new RenderMessageFilter(
           GetID(),
-          PluginServiceImpl::GetInstance(),
+          plugin_service,
           GetBrowserContext(),
           GetBrowserContext()->GetRequestContextForRenderProcess(GetID()),
           widget_helper_,