Avoid exiting the renderer process if it has a pending render view.

content/browser/tab_contents/render_view_host_manager.h

Index: content/browser/tab_contents/render_view_host_manager.h
diff --git a/content/browser/tab_contents/render_view_host_manager.h b/content/browser/tab_contents/render_view_host_manager.h
index 01ddbc8c6efc9e4ee16dd8de75ac60a555868ceb..7e1cf2d4b5a3ff4b6d915097bc89b5dfc218f62c 100644
--- a/content/browser/tab_contents/render_view_host_manager.h
+++ b/content/browser/tab_contents/render_view_host_manager.h
@@ -144,6 +144,10 @@ class RenderViewHostManager
   // Called when a provisional load on the given renderer is aborted.
   void RendererAbortedProvisionalLoad(RenderViewHost* render_view_host);
 
+  // Called when a renderer process is starting to close.  We should not
+  // schedule new navigations in its swapped out RenderViewHosts after this.
+  void RendererProcessClosing(RenderProcessHost* render_process_host);
+
   // Sets the passed passed interstitial as the currently showing interstitial.
   // |interstitial_page| should be non NULL (use the remove_interstitial_page
   // method to unset the interstitial) and no interstitial page should be set