Add some missing ENABLE_PLUGINS ifdefs.

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index fba815b4f82ea7873e1a1cebed0e416bbe333fb6..9abebd77adbf8d32cc2ecf8a9bf1f6b4ebb04bc0 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -133,7 +133,9 @@ class CONTENT_EXPORT RenderMessageFilter : public BrowserMessageFilter {
   friend class BrowserThread;
   friend class base::DeleteHelper<RenderMessageFilter>;
 
+#if defined(ENABLE_PLUGINS)
   class OpenChannelToNpapiPluginCallback;
+#endif
 
   void OnGetProcessMemorySizes(size_t* private_bytes, size_t* shared_bytes);
   void OnCreateWindow(const ViewHostMsg_CreateWindow_Params& params,
@@ -277,8 +279,10 @@ class CONTENT_EXPORT RenderMessageFilter : public BrowserMessageFilter {
 
   bool CheckBenchmarkingEnabled() const;
   bool CheckPreparsedJsCachingEnabled() const;
+#if defined(ENABLE_PLUGINS)
   void OnCompletedOpenChannelToNpapiPlugin(
       OpenChannelToNpapiPluginCallback* client);
+#endif
 
   void OnAre3DAPIsBlocked(int render_view_id,
                           const GURL& top_origin_url,
@@ -333,7 +337,9 @@ class CONTENT_EXPORT RenderMessageFilter : public BrowserMessageFilter {
 
   int render_process_id_;
 
+#if defined(ENABLE_PLUGINS)
   std::set<OpenChannelToNpapiPluginCallback*> plugin_host_clients_;
+#endif
 
   media::AudioManager* audio_manager_;
   MediaInternals* media_internals_;