Bug 1498720 - Ensure that we revoke a subframe's storage access when it is removed from the DOM r=baku

Differential Revision: https://phabricator.services.mozilla.com/D8615

docshell/base/nsDocShell.cpp

@@ -2988,6 +2988,12 @@ nsDocShell::SetDocLoaderParent(nsDocLoader* aParent)
   // Our parent has changed. Recompute scriptability.
   RecomputeCanExecuteScripts();
 
+  nsCOMPtr<nsPIDOMWindowOuter> window = GetWindow();
+  if (window) {
+    auto* win = nsGlobalWindowOuter::Cast(window);
+    win->ParentWindowChanged();
+  }
+
   NS_ASSERTION(mInheritPrivateBrowsingId || wasPrivate == UsePrivateBrowsing(),
                "Private browsing state changed while inheritance was disabled");