Abandon prerenders upon render thread shutdown.

third_party/WebKit/Source/web/tests/PrerenderingTest.cpp

 /*
  * Copyright (C) 2012 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 142 matching lines @@
     void cancel(const WebPrerender& prerender) override
     {
         m_canceledPrerenders.append(prerender);
     }
 
     void abandon(const WebPrerender& prerender) override
     {
         m_abandonedPrerenders.append(prerender);
     }
 
+    void detachRenderer() override
+    {
+        clear();
+    }
+
     Vector<WebPrerender> m_addedPrerenders;
     Vector<WebPrerender> m_canceledPrerenders;
     Vector<WebPrerender> m_abandonedPrerenders;
 };
 
 class PrerenderingTest : public testing::Test {
 public:
     ~PrerenderingTest() override
     {
         Platform::current()->getURLLoaderMockFactory()->unregisterAllURLs();
@@ skipping 316 matching lines @@
     WebPrerender relNextOnly = prerendererClient()->releaseWebPrerender();
     EXPECT_EQ(toWebURL("http://rel-next-only.com/"), relNextOnly.url());
     EXPECT_EQ(PrerenderRelTypeNext, relNextOnly.relTypes());
 
     WebPrerender relNextAndPrerender = prerendererClient()->releaseWebPrerender();
     EXPECT_EQ(toWebURL("http://rel-next-and-prerender.com/"), relNextAndPrerender.url());
     EXPECT_EQ(static_cast<unsigned>(PrerenderRelTypeNext | PrerenderRelTypePrerender), relNextAndPrerender.relTypes());
 }
 
 } // namespace