Require WebLocalFrame to be created with a non-null client

third_party/WebKit/Source/web/WebFrameClient.cpp

+// 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 "public/web/WebFrameClient.h"
+
+#include "public/web/WebFrameWidget.h"
+#include "public/web/WebLocalFrame.h"
+
+namespace blink {
+
+void WebFrameClient::frameDetached(WebLocalFrame* frame, DetachType type)
+{
+    if (type == DetachType::Remove && frame->parent())
+        frame->parent()->removeChild(frame);
+
+    if (frame->frameWidget())
+        frame->frameWidget()->close();
+
+    frame->close();
+}
+
+} // namespace blink