Don't destroy a request while it is being processed

content/browser/renderer_host/resource_dispatcher_host.h

Index: content/browser/renderer_host/resource_dispatcher_host.h
diff --git a/content/browser/renderer_host/resource_dispatcher_host.h b/content/browser/renderer_host/resource_dispatcher_host.h
index a177719ad56946c4c4f71dd0501667838fede0e2..33757df1c9b1cfce54343f4c6133b8c078d3b304 100644
--- a/content/browser/renderer_host/resource_dispatcher_host.h
+++ b/content/browser/renderer_host/resource_dispatcher_host.h
@@ -317,8 +317,10 @@ class ResourceDispatcherHost : public net::URLRequest::Delegate {
   // Helper function for regular and download requests.
   void BeginRequestInternal(net::URLRequest* request);
 
-  // Helper function that cancels |request|.
-  void CancelRequestInternal(net::URLRequest* request, bool from_renderer);
+  // Helper function that cancels |request|.  Returns whether the
+  // request was actually cancelled.  If a renderer cancels a request
+  // for a download, we ignore the cancellation.
+  bool CancelRequestInternal(net::URLRequest* request, bool from_renderer);
 
   // Helper function that inserts |request| into the resource queue.
   void InsertIntoResourceQueue(