Moved the following IPCs out of chrome into content where they are handled by

chrome/browser/prerender/prerender_tab_helper.cc

Index: chrome/browser/prerender/prerender_tab_helper.cc
===================================================================
--- chrome/browser/prerender/prerender_tab_helper.cc	(revision 99462)
+++ chrome/browser/prerender/prerender_tab_helper.cc	(working copy)
@@ -207,19 +207,10 @@
   MaybeUsePrerenderedPage(url, has_opener_set);
 }
 
-bool PrerenderTabHelper::OnMessageReceived(const IPC::Message& message) {
-  IPC_BEGIN_MESSAGE_MAP(PrerenderTabHelper, message)
-    IPC_MESSAGE_HANDLER(ViewHostMsg_DidStartProvisionalLoadForFrame,
-                        OnDidStartProvisionalLoadForFrame)
-    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateTargetURL, OnMsgUpdateTargetURL)
-  IPC_END_MESSAGE_MAP()
-  return false;
-}
-
-void PrerenderTabHelper::OnDidStartProvisionalLoadForFrame(int64 frame_id,
-                                                           bool is_main_frame,
-                                                           bool has_opener_set,
-                                                           const GURL& url) {
+void PrerenderTabHelper::DidStartProvisionalLoadForFrame(int64 frame_id,
+                                                         bool is_main_frame,
+                                                         bool has_opener_set,
+                                                         const GURL& url) {
   if (is_main_frame) {
     RecordPageviewEvent(PAGEVIEW_EVENT_LOAD_START);
     if (IsTopSite(url))
@@ -236,7 +227,7 @@
   }
 }
 
-void PrerenderTabHelper::OnMsgUpdateTargetURL(int32 page_id, const GURL& url) {
+void PrerenderTabHelper::UpdateTargetURL(int32 page_id, const GURL& url) {
   for (int i = 0; i < kNumHoverThresholds; i++)
     last_hovers_[i].RecordHover(url);