Commiting the changes from my previous cl that are specific to not including ...

chrome/browser/renderer_host/render_view_host.cc

Index: chrome/browser/renderer_host/render_view_host.cc
===================================================================
--- chrome/browser/renderer_host/render_view_host.cc	(revision 9176)
+++ chrome/browser/renderer_host/render_view_host.cc	(working copy)
@@ -22,6 +22,7 @@
 #include "chrome/browser/tab_contents/navigation_entry.h"
 #include "chrome/browser/tab_contents/site_instance.h"
 #include "chrome/browser/tab_contents/web_contents.h"
+#include "chrome/common/render_messages.h"
 #include "chrome/common/resource_bundle.h"
 #include "chrome/common/thumbnail_score.h"
 #include "net/base/net_util.h"
@@ -670,7 +671,7 @@
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateTitle, OnMsgUpdateTitle)
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateEncoding, OnMsgUpdateEncoding)
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateTargetURL, OnMsgUpdateTargetURL)
-    IPC_MESSAGE_HANDLER_GENERIC(ViewHostMsg_Thumbnail, OnMsgThumbnail(msg))
+    IPC_MESSAGE_HANDLER(ViewHostMsg_Thumbnail, OnMsgThumbnail)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Close, OnMsgClose)
     IPC_MESSAGE_HANDLER(ViewHostMsg_RequestMove, OnMsgRequestMove)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidStartLoading, OnMsgDidStartLoading)
@@ -891,22 +892,9 @@
   Send(new ViewMsg_UpdateTargetURL_ACK(routing_id()));
 }
 
-void RenderViewHost::OnMsgThumbnail(const IPC::Message& msg) {
-  // crack the message
-  void* iter = NULL;
-  GURL url;
-  if (!IPC::ParamTraits<GURL>::Read(&msg, &iter, &url))
-    return;
-
-  ThumbnailScore score;
-  if (!IPC::ParamTraits<ThumbnailScore>::Read(&msg, &iter, &score))
-    return;
-
-  // thumbnail data
-  SkBitmap bitmap;
-  if (!IPC::ParamTraits<SkBitmap>::Read(&msg, &iter, &bitmap))
-    return;
-
+void RenderViewHost::OnMsgThumbnail(const GURL& url,
+                                    const ThumbnailScore& score,
+                                    const SkBitmap& bitmap) {
   delegate_->UpdateThumbnail(url, bitmap, score);
 }