We have a problem in the process on destroying WebContentsImpl because

android_webview/native/aw_contents_io_thread_client_impl.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 "android_webview/native/aw_contents_io_thread_client_impl.h"
 
 #include <map>
 #include <utility>
 
 #include "android_webview/common/devtools_instrumentation.h"
@@ skipping 124 matching lines @@
   client_data.io_thread_client = jdelegate_;
   client_data.pending_association = false;
   RfhToIoThreadClientMap::GetInstance()->Set(
       GetRenderFrameHostIdPair(rfh), client_data);
 }
 
 void ClientMapEntryUpdater::RenderFrameDeleted(RenderFrameHost* rfh) {
   RfhToIoThreadClientMap::GetInstance()->Erase(GetRenderFrameHostIdPair(rfh));
 }
 
-void ClientMapEntryUpdater::WebContentsDestroyed(WebContents* web_contents) {
+void ClientMapEntryUpdater::WebContentsDestroyed() {
   delete this;
 }
 
 } // namespace
 
 // AwContentsIoThreadClientImpl -----------------------------------------------
 
 // static
 scoped_ptr<AwContentsIoThreadClient>
 AwContentsIoThreadClient::FromID(int render_process_id, int render_frame_id) {
@@ skipping 174 matching lines @@
 
   Java_AwContentsIoThreadClient_newLoginRequest(
       env, java_object_.obj(), jrealm.obj(), jaccount.obj(), jargs.obj());
 }
 
 bool RegisterAwContentsIoThreadClientImpl(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 } // namespace android_webview