move favicon download code from chrome/ into content/

chrome/browser/prerender/prerender_render_view_host_observer.cc

Index: chrome/browser/prerender/prerender_render_view_host_observer.cc
diff --git a/chrome/browser/prerender/prerender_render_view_host_observer.cc b/chrome/browser/prerender/prerender_render_view_host_observer.cc
index fdc6342bfbb55a90abd26251577f3493247f5f6c..7317b6107694bcb6d002ffd7fe2b95e01665d12a 100644
--- a/chrome/browser/prerender/prerender_render_view_host_observer.cc
+++ b/chrome/browser/prerender/prerender_render_view_host_observer.cc
@@ -5,7 +5,6 @@
 #include "chrome/browser/prerender/prerender_render_view_host_observer.h"
 
 #include "chrome/browser/prerender/prerender_contents.h"
-#include "chrome/common/icon_messages.h"
 #include "chrome/common/render_messages.h"
 
 using content::RenderViewHost;
@@ -34,7 +33,6 @@ bool PrerenderRenderViewHostObserver::OnMessageReceived(
   bool handled = true;
   // The following messages we do want to consume.
   IPC_BEGIN_MESSAGE_MAP(PrerenderRenderViewHostObserver, message)
-    IPC_MESSAGE_HANDLER(IconHostMsg_UpdateFaviconURL, OnUpdateFaviconURL)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_MaybeCancelPrerenderForHTML5Media,
                         OnMaybeCancelPrerenderForHTML5Media)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_CancelPrerenderForPrinting,
@@ -55,12 +53,6 @@ bool PrerenderRenderViewHostObserver::Send(IPC::Message* message) {
   return content::RenderViewHostObserver::Send(message);
 }
 
-void PrerenderRenderViewHostObserver::OnUpdateFaviconURL(
-    int32 page_id,
-    const std::vector<FaviconURL>& urls) {
-  prerender_contents_->OnUpdateFaviconURL(page_id, urls);
-}
-
 void PrerenderRenderViewHostObserver::OnMaybeCancelPrerenderForHTML5Media() {
   prerender_contents_->Destroy(FINAL_STATUS_HTML5_MEDIA);
 }