Clear navigation_handle early in RenderFrameHostImpl destructor.

content/browser/devtools/render_frame_devtools_agent_host.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 "content/browser/devtools/render_frame_devtools_agent_host.h"
 
 #include <tuple>
 #include <utility>
 
 #include "base/guid.h"
@@ skipping 894 matching lines @@
       current_->DispatchProtocolMessage(
           pair.second.session_id, pair.first, pair.second.method,
           pair.second.message);
     }
     in_navigation_protocol_message_buffer_.clear();
   }
 }
 
 void RenderFrameDevToolsAgentHost::UpdateProtocolHandlers(
     RenderFrameHostImpl* host) {
+#if DCHECK_IS_ON()
+  // Check that we don't have stale host object here by accessing some random
+  // properties inside.
+  if (handlers_frame_host_ && handlers_frame_host_->GetRenderWidgetHost())
+    handlers_frame_host_->GetRenderWidgetHost()->GetRoutingID();
+#endif
   handlers_frame_host_ = host;
   dom_handler_->SetRenderFrameHost(host);
   if (emulation_handler_)
     emulation_handler_->SetRenderFrameHost(host);
   input_handler_->SetRenderWidgetHost(
       host ? host->GetRenderWidgetHost() : nullptr);
   inspector_handler_->SetRenderFrameHost(host);
   network_handler_->SetRenderFrameHost(host);
   if (page_handler_)
     page_handler_->SetRenderFrameHost(host);
@@ skipping 215 matching lines @@
     RenderFrameHost* host) {
   return (current_ && current_->host() == host) ||
       (pending_ && pending_->host() == host);
 }
 
 bool RenderFrameDevToolsAgentHost::IsChildFrame() {
   return current_ && current_->host()->GetParent();
 }
 
 }  // namespace content