Abandon prerenders upon render thread shutdown.

chrome/renderer/prerender/prerender_dispatcher.cc

 // Copyright (c) 2012 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 "chrome/renderer/prerender/prerender_dispatcher.h"
 
 #include <stddef.h>
 
 #include "base/logging.h"
 #include "chrome/common/prerender_messages.h"
@@ skipping 109 matching lines @@
     IPC_MESSAGE_HANDLER(PrerenderMsg_OnPrerenderAddAlias, OnPrerenderAddAlias)
     IPC_MESSAGE_HANDLER(PrerenderMsg_OnPrerenderRemoveAliases,
                         OnPrerenderRemoveAliases)
     IPC_MESSAGE_HANDLER(PrerenderMsg_OnPrerenderStop, OnPrerenderStop)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   return handled;
 }
 
+void PrerenderDispatcher::OnRenderProcessShutdown() {
+  // Renderer is shutting down, abandon all in-flight prerenders.
+  for (auto it : prerenders_) {
+    const PrerenderExtraData& extra_data =
+        PrerenderExtraData::FromPrerender(it.second);
+    content::RenderThread::Get()->Send(
+        new PrerenderHostMsg_AbandonLinkRelPrerender(
+            extra_data.prerender_id()));
+  }
+  prerenders_.clear();
+}
+
 void PrerenderDispatcher::add(const WebPrerender& prerender) {
   const PrerenderExtraData& extra_data =
       PrerenderExtraData::FromPrerender(prerender);
   if (prerenders_.count(extra_data.prerender_id()) != 0) {
     // TODO(gavinp): Determine why these apparently duplicate adds occur.
     return;
   }
 
   prerenders_[extra_data.prerender_id()] = prerender;
 
@@ skipping 28 matching lines @@
   content::RenderThread::Get()->Send(
       new PrerenderHostMsg_AbandonLinkRelPrerender(extra_data.prerender_id()));
   // The browser will not send an OnPrerenderStop (the prerender may have even
   // been canceled before it was started), so release it to avoid a
   // leak. Moreover, if it did, the PrerenderClient in Blink will have been
   // detached already.
   prerenders_.erase(extra_data.prerender_id());
 }
 
 }  // namespace prerender