Cancel the request when URLLoader is gone

content/common/url_loader.mojom

Index: content/common/url_loader.mojom
diff --git a/content/common/url_loader.mojom b/content/common/url_loader.mojom
index bdb72581d55bdde987884480169cbdd3ff2fd151..9d99f47bb80e99d176e5a0947233c750e2188f69 100644
--- a/content/common/url_loader.mojom
+++ b/content/common/url_loader.mojom
@@ -18,11 +18,6 @@ interface URLLoader {
   // then upon receiving an URLResponse with a non-NULL |redirect_url| field,
   // |FollowRedirect| may be called to load the URL indicated by the redirect.
   FollowRedirect();
-
-  // Cancels the request. The service will cancel loading, but there may be some
-  // time lag and it is possible that the client gets some notification after
-  // calling this method for a while.
-  Cancel();
 };
 
 interface URLLoaderClient {