Ensure RemoteFontFaceSource doesn't try to start a load in a detached document

third_party/WebKit/Source/platform/testing/weburl_loader_mock.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/testing/weburl_loader_mock.h"
 
 #include "platform/testing/weburl_loader_mock_factory_impl.h"
 #include "public/platform/URLConversion.h"
 #include "public/platform/WebData.h"
 #include "public/platform/WebURLError.h"
@@ skipping 136 matching lines @@
   }
 
   // Ignores setDefersLoading(false) safely.
   if (!deferred)
     return;
 
   // setDefersLoading(true) is not implemented.
   NOTIMPLEMENTED();
 }
 
-void WebURLLoaderMock::setLoadingTaskRunner(WebTaskRunner*) {
+void WebURLLoaderMock::setLoadingTaskRunner(WebTaskRunner* runner) {
   // In principle this is NOTIMPLEMENTED(), but if we put that here it floods
   // the console during webkit unit tests, so we leave the function empty.
+  DCHECK(runner);
 }
 
 WeakPtr<WebURLLoaderMock> WebURLLoaderMock::GetWeakPtr() {
   return weak_factory_.createWeakPtr();
 }
 
 } // namespace blink