Bug 1191112 part 2 - Set the destroyed flag on nsCocoaWindow when destroyed. r=smichaud

--HG--
extra : source : d06d4277d3b203f2053c2aadaed7e5beb801023f

widget/cocoa/nsCocoaWindow.mm

@@ -500,6 +500,10 @@ NS_IMETHODIMP nsCocoaWindow::CreatePopupContentView(const nsIntRect &aRect)
 
 NS_IMETHODIMP nsCocoaWindow::Destroy()
 {
+  if (mOnDestroyCalled)
+    return NS_OK;
+  mOnDestroyCalled = true;
+
   // If we don't hide here we run into problems with panels, this is not ideal.
   // (Bug 891424)
   Show(false);