Fix 3 crashes related to navigations after a process dies.

content/browser/frame_host/render_frame_host_manager.h

Index: content/browser/frame_host/render_frame_host_manager.h
diff --git a/content/browser/frame_host/render_frame_host_manager.h b/content/browser/frame_host/render_frame_host_manager.h
index 12e1a1fbb9de758a700060055a4fe5f8090fd900..84b500e39e5efcd8b70d288f63d415da29fb96cf 100644
--- a/content/browser/frame_host/render_frame_host_manager.h
+++ b/content/browser/frame_host/render_frame_host_manager.h
@@ -387,6 +387,10 @@ class CONTENT_EXPORT RenderFrameHostManager
   // Returns whether |render_frame_host| is on the pending deletion list.
   bool IsPendingDeletion(RenderFrameHostImpl* render_frame_host);
 
+  // Returns whether |render_view_host| will be deleted when its main
+  // RenderFrameHost is deleted from the pending deletion list.
+  bool IsViewPendingDeletion(RenderViewHostImpl* render_view_host);
+
   // If |render_frame_host| is on the pending deletion list, this deletes it.
   // Returns whether it was deleted.
   bool DeleteFromPendingList(RenderFrameHostImpl* render_frame_host);