Add fallback mechanism to release Extension ports if the JS context has been destroyed.

extensions/renderer/resources/guest_view/web_view/web_view_action_requests.js

Index: extensions/renderer/resources/guest_view/web_view/web_view_action_requests.js
diff --git a/extensions/renderer/resources/guest_view/web_view/web_view_action_requests.js b/extensions/renderer/resources/guest_view/web_view/web_view_action_requests.js
index e58e620d2ae19dc0e7e0d7483676ab1ab36811c8..f5be50aecd571bd4fa838a9dc9c3a14656e5989b 100644
--- a/extensions/renderer/resources/guest_view/web_view/web_view_action_requests.js
+++ b/extensions/renderer/resources/guest_view/web_view/web_view_action_requests.js
@@ -66,7 +66,8 @@ WebViewActionRequest.prototype.handleActionRequestEvent = function() {
 
   if (defaultPrevented) {
     // Track the lifetime of |request| with the garbage collector.
-    MessagingNatives.BindToGC(request, this.defaultAction.bind(this));
+    var portId = -1;  // (hack) there is no Extension Port to release
+    MessagingNatives.BindToGC(request, this.defaultAction.bind(this), portId);
   } else {
     this.defaultAction();
   }