Create a RenderProcess message class and move keygen to it.

content/browser/frame_host/render_frame_message_filter.h

Index: content/browser/frame_host/render_frame_message_filter.h
diff --git a/content/browser/frame_host/render_frame_message_filter.h b/content/browser/frame_host/render_frame_message_filter.h
index 4668aeb59db03d7752b75cfbe23b8cf63fb18fef..1639b1d3b4420a75518fe88432511b0087c8bbeb 100644
--- a/content/browser/frame_host/render_frame_message_filter.h
+++ b/content/browser/frame_host/render_frame_message_filter.h
@@ -28,7 +28,6 @@
 class GURL;
 
 namespace net {
-class KeygenHandler;
 class URLRequestContext;
 class URLRequestContextGetter;
 }
@@ -105,15 +104,6 @@ class RenderFrameMessageFilter : public BrowserMessageFilter {
                           ThreeDAPIType context_type,
                           int arb_robustness_status_code);
 
-  void OnKeygen(uint32 key_size_index,
-                const std::string& challenge_string,
-                const GURL& url,
-                IPC::Message* reply_msg);
-  void PostKeygenToWorkerThread(IPC::Message* reply_msg,
-                                scoped_ptr<net::KeygenHandler> keygen_handler);
-  void OnKeygenOnWorkerThread(scoped_ptr<net::KeygenHandler> keygen_handler,
-                              IPC::Message* reply_msg);
-
 #if defined(OS_MACOSX)
   // Messages for OOP font loading.
   void OnLoadFont(const FontDescriptor& font, IPC::Message* reply_msg);