content: permissions: add plumbing to revoke permissions

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..718324722682f21cbb804505bee03d7b6e2a9889 100644
--- a/content/child/permissions/permission_dispatcher_thread_proxy.h
+++ b/content/child/permissions/permission_dispatcher_thread_proxy.h
@@ -35,7 +35,10 @@ class PermissionDispatcherThreadProxy :
   // blink::WebPermissionClient implementation.
   virtual void queryPermission(blink::WebPermissionType type,
                                const blink::WebURL& origin,
-                               blink::WebPermissionQueryCallback* callback);
+                               blink::WebPermissionCallback* callback);
+  virtual void revokePermission(blink::WebPermissionType type,
+                                const blink::WebURL& origin,
+                                blink::WebPermissionCallback* callback);
   virtual void startListening(blink::WebPermissionType type,
                               const blink::WebURL& origin,
                               blink::WebPermissionObserver* observer);