Fix a race condition where rapid back/forward clicks could close a tab...

chrome/renderer/render_view.cc

Index: chrome/renderer/render_view.cc
===================================================================
--- chrome/renderer/render_view.cc	(revision 21465)
+++ chrome/renderer/render_view.cc	(working copy)
@@ -2727,8 +2727,7 @@
   Send(new ViewHostMsg_ShouldClose_ACK(routing_id_, should_close));
 }
 
-void RenderView::OnClosePage(int new_render_process_host_id,
-                             int new_request_id) {
+void RenderView::OnClosePage(const ViewMsg_ClosePage_Params& params) {
   // TODO(creis): We'd rather use webview()->Close() here, but that currently
   // sets the WebView's delegate_ to NULL, preventing any JavaScript dialogs
   // in the onunload handler from appearing.  For now, we're bypassing that and
@@ -2742,14 +2741,13 @@
     // TODO(davemoore) this code should be removed once WillCloseFrame() gets
     // called when a page is destroyed. DumpLoadHistograms() is safe to call
     // multiple times for the same frame, but it will simplify things.
-    if (url.SchemeIs("http") || url.SchemeIs("https"))
+    if (url.SchemeIs(chrome::kHttpScheme) || url.SchemeIs(chrome::kHttpsScheme))
       DumpLoadHistograms();
     main_frame->ClosePage();
   }
 
-  Send(new ViewHostMsg_ClosePage_ACK(routing_id_,
-                                     new_render_process_host_id,
-                                     new_request_id));
+  // Just echo back the params in the ACK.
+  Send(new ViewHostMsg_ClosePage_ACK(routing_id_, params));
 }
 
 void RenderView::OnThemeChanged() {