Add UMA counter for hung renderers on cross-site navigation.

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index f6d340d5ad5c33afc73ccd2576e1bcca42fe1125..20441cd79e09642a29733776126555155860a1bd 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -72,8 +72,7 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
   // ResourceDispatcherHost.  Necessary for a cross-site request, in the case
   // that the original RenderViewHost is not live and thus cannot run an
   // unload handler.
-  virtual void CrossSiteSwapOutACK(
-      const ViewMsg_SwapOut_Params& params) = 0;
+  virtual void SimulateSwapOutACK(const ViewMsg_SwapOut_Params& params) = 0;
 
   // Called to wait for the next UpdateRect message for the specified render
   // widget.  Returns true if successful, and the msg out-param will contain a