Fix WebRemoteFrame leak in DetachRemoteFrame unit test.

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 7581 matching lines @@
 TEST_P(ParameterizedWebFrameTest, DetachRemoteFrame)
 {
     FrameTestHelpers::TestWebViewClient viewClient;
     FrameTestHelpers::TestWebRemoteFrameClient remoteClient;
     WebView* view = WebView::create(&viewClient);
     view->setMainFrame(remoteClient.frame());
     FrameTestHelpers::TestWebRemoteFrameClient childFrameClient;
     WebRemoteFrame* childFrame = view->mainFrame()->toWebRemoteFrame()->createRemoteChild(WebTreeScopeType::Document, "", WebSandboxFlags::None, &childFrameClient);
     childFrame->detach();
     view->close();
+    childFrame->close();
 }
 
 class TestConsoleMessageWebFrameClient : public FrameTestHelpers::TestWebFrameClient {
 public:
     virtual void didAddMessageToConsole(const WebConsoleMessage& message, const WebString& sourceName, unsigned sourceLine, const WebString& stackTrace)
     {
         messages.push_back(message);
     }
 
     std::vector<WebConsoleMessage> messages;
@@ skipping 375 matching lines @@
 
 TEST_F(WebFrameTest, MaxFramesDetach)
 {
     registerMockedHttpURLLoad("max-frames-detach.html");
     FrameTestHelpers::WebViewHelper webViewHelper;
     WebViewImpl* webViewImpl = webViewHelper.initializeAndLoad(m_baseURL + "max-frames-detach.html", true);
     webViewImpl->mainFrameImpl()->collectGarbage();
 }
 
 } // namespace blink