Simplify the magic required to create IPC message headers a bit.

chrome/browser/renderer_host/render_widget_host.cc

Index: chrome/browser/renderer_host/render_widget_host.cc
===================================================================
--- chrome/browser/renderer_host/render_widget_host.cc	(revision 68536)
+++ chrome/browser/renderer_host/render_widget_host.cc	(working copy)
@@ -843,7 +843,7 @@
     if (dib) {
       if (dib->size() < size) {
         DLOG(WARNING) << "Transport DIB too small for given rectangle";
-        process()->ReceivedBadMessage(ViewHostMsg_UpdateRect__ID);
+        process()->ReceivedBadMessage(ViewHostMsg_UpdateRect::ID);
       } else {
         // Scroll the backing store.
         if (!params.scroll_rect.IsEmpty()) {
@@ -951,12 +951,12 @@
 
 void RenderWidgetHost::OnMsgFocus() {
   // Only RenderViewHost can deal with that message.
-  process()->ReceivedBadMessage(ViewHostMsg_Focus__ID);
+  process()->ReceivedBadMessage(ViewHostMsg_Focus::ID);
 }
 
 void RenderWidgetHost::OnMsgBlur() {
   // Only RenderViewHost can deal with that message.
-  process()->ReceivedBadMessage(ViewHostMsg_Blur__ID);
+  process()->ReceivedBadMessage(ViewHostMsg_Blur::ID);
 }
 
 void RenderWidgetHost::OnMsgSetCursor(const WebCursor& cursor) {