We have a problem in the process on destroying WebContentsImpl because

content/browser/android/content_settings.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/android/content_settings.h"
 
 #include "base/android/jni_android.h"
 #include "content/browser/android/content_view_core_impl.h"
 #include "content/browser/renderer_host/render_view_host_delegate.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
@@ skipping 24 matching lines @@
   return RegisterNativesImpl(env);
 }
 
 bool ContentSettings::GetJavaScriptEnabled(JNIEnv* env, jobject obj) {
   RenderViewHost* render_view_host = web_contents()->GetRenderViewHost();
   if (!render_view_host)
     return false;
   return render_view_host->GetDelegate()->GetWebkitPrefs().javascript_enabled;
 }
 
-void ContentSettings::WebContentsDestroyed(WebContents* web_contents) {
+void ContentSettings::WebContentsDestroyed() {
   delete this;
 }
 
 static jlong Init(JNIEnv* env, jobject obj, jlong nativeContentViewCore) {
   WebContents* web_contents =
       reinterpret_cast<ContentViewCoreImpl*>(nativeContentViewCore)
           ->GetWebContents();
   ContentSettings* content_settings =
       new ContentSettings(env, obj, web_contents);
   return reinterpret_cast<intptr_t>(content_settings);
 }
 
 }  // namespace content