Allow script to request durable storage permission (chrome side)

content/child/permissions/permission_dispatcher_thread_proxy.h

Index: content/child/permissions/permission_dispatcher_thread_proxy.h
diff --git a/content/child/permissions/permission_dispatcher_thread_proxy.h b/content/child/permissions/permission_dispatcher_thread_proxy.h
index 65d07eb514bf72d0dd5148ae8d54fd0725cde9a1..b97f60db0cb4e384ec460960d321491b8e2385c9 100644
--- a/content/child/permissions/permission_dispatcher_thread_proxy.h
+++ b/content/child/permissions/permission_dispatcher_thread_proxy.h
@@ -33,6 +33,11 @@ class PermissionDispatcherThreadProxy :
       PermissionDispatcher* permissions_dispatcher);
 
   // blink::WebPermissionClient implementation.
+  virtual void requestDurablePermission(const blink::WebURL&,
+      blink::WebPermissionQueryCallback*) {
+//    NOTREACHED();
+  }
+
   virtual void queryPermission(blink::WebPermissionType type,
                                const blink::WebURL& origin,
                                blink::WebPermissionQueryCallback* callback);