We have a problem in the process on destroying WebContentsImpl because

android_webview/native/aw_contents_io_thread_client_impl.cc

Index: android_webview/native/aw_contents_io_thread_client_impl.cc
diff --git a/android_webview/native/aw_contents_io_thread_client_impl.cc b/android_webview/native/aw_contents_io_thread_client_impl.cc
index c863971242017c0ee15813f9a821a1e39d667c8a..555cd83cb08e0545e879318b4c03670516f74aef 100644
--- a/android_webview/native/aw_contents_io_thread_client_impl.cc
+++ b/android_webview/native/aw_contents_io_thread_client_impl.cc
@@ -112,7 +112,7 @@ class ClientMapEntryUpdater : public content::WebContentsObserver {
 
   virtual void RenderFrameCreated(RenderFrameHost* render_frame_host) OVERRIDE;
   virtual void RenderFrameDeleted(RenderFrameHost* render_frame_host) OVERRIDE;
-  virtual void WebContentsDestroyed(WebContents* web_contents) OVERRIDE;
+  virtual void WebContentsDestroyed() OVERRIDE;
 
  private:
   JavaObjectWeakGlobalRef jdelegate_;
@@ -142,7 +142,7 @@ void ClientMapEntryUpdater::RenderFrameDeleted(RenderFrameHost* rfh) {
   RfhToIoThreadClientMap::GetInstance()->Erase(GetRenderFrameHostIdPair(rfh));
 }
 
-void ClientMapEntryUpdater::WebContentsDestroyed(WebContents* web_contents) {
+void ClientMapEntryUpdater::WebContentsDestroyed() {
   delete this;
 }