Fix for 1498134, possible crash when cancelling a url request. The...

chrome/browser/resource_dispatcher_host.h

Index: chrome/browser/resource_dispatcher_host.h
===================================================================
--- chrome/browser/resource_dispatcher_host.h	(revision 5928)
+++ chrome/browser/resource_dispatcher_host.h	(working copy)
@@ -396,6 +396,14 @@
   // true on success.
   bool CompleteResponseStarted(URLRequest* request);
 
+  // Cancels the given request if it still exists. We ignore cancels from the
+  // renderer in the event of a download. If |allow_delete| is true and no IO
+  // is pending, the request is removed and deleted.
+  void CancelRequest(int render_process_host_id,
+                     int request_id,
+                     bool from_renderer,
+                     bool allow_delete);
+
   // Helper function for regular and download requests.
   void BeginRequestInternal(URLRequest* request, bool mixed_content);