Destroy the old RenderWidgetHostView when swapping out a main frame.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 599 matching lines @@
                            RenderViewInitAfterNewProxyAndProcessKill);
   FRIEND_TEST_ALL_PREFIXES(RenderFrameHostManagerTest,
                            UnloadPushStateOnCrossProcessNavigation);
   FRIEND_TEST_ALL_PREFIXES(RenderFrameHostManagerTest,
                            WebUIJavascriptDisallowedAfterSwapOut);
   FRIEND_TEST_ALL_PREFIXES(RenderFrameHostManagerTest, LastCommittedOrigin);
   FRIEND_TEST_ALL_PREFIXES(SitePerProcessBrowserTest, CrashSubframe);
   FRIEND_TEST_ALL_PREFIXES(SitePerProcessBrowserTest,
                            RenderViewHostIsNotReusedAfterDelayedSwapOutACK);
   FRIEND_TEST_ALL_PREFIXES(SitePerProcessBrowserTest,
+                           RenderViewHostStaysActiveWithLateSwapoutACK);
+  FRIEND_TEST_ALL_PREFIXES(SitePerProcessBrowserTest,
                            LoadEventForwardingWhilePendingDeletion);
 
   // IPC Message handlers.
   void OnDidAddMessageToConsole(int32_t level,
                                 const base::string16& message,
                                 int32_t line_no,
                                 const base::string16& source_id);
   void OnDetach();
   void OnFrameFocused();
   void OnOpenURL(const FrameHostMsg_OpenURL_Params& params);
@@ skipping 460 matching lines @@
       remote_associated_interfaces_;
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_