We have a problem in the process on destroying WebContentsImpl because

chrome/browser/ui/ash/launcher/browser_status_monitor.cc

 // 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.
 
 #include "chrome/browser/ui/ash/launcher/browser_status_monitor.h"
 
 #include "ash/shelf/shelf_util.h"
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
 #include "base/stl_util.h"
@@ skipping 42 matching lines @@
       state = ChromeLauncherController::APP_STATE_ACTIVE;
 
     monitor_->UpdateAppItemState(web_contents(), state);
     monitor_->UpdateBrowserItemState();
 
     // Navigating may change the ShelfID associated with the WebContents.
     if (browser->tab_strip_model()->GetActiveWebContents() == web_contents())
       monitor_->SetShelfIDForBrowserWindowContents(browser, web_contents());
   }
 
-  virtual void WebContentsDestroyed(
-      content::WebContents* web_content) OVERRIDE {
-    if (web_content == web_contents()) {
-      // We can only come here when there was a non standard termination like
-      // an app got un-installed while running, etc.
-      monitor_->WebContentsDestroyed(web_content);
-      // |this| is gone now.
-    }
+  virtual void WebContentsDestroyed() OVERRIDE {
+    // We can only come here when there was a non standard termination like
+    // an app got un-installed while running, etc.
+    monitor_->WebContentsDestroyed(web_contents());
+    // |this| is gone now.
   }
 
  private:
   BrowserStatusMonitor* monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalWebContentsObserver);
 };
 
 // Observes any new settings windows and sets their shelf icon (since they
 // are excluded from BrowserShortcutLauncherItem).
@@ skipping 303 matching lines @@
     content::WebContents* contents) {
   return launcher_controller_->GetShelfIDForWebContents(contents);
 }
 
 void BrowserStatusMonitor::SetShelfIDForBrowserWindowContents(
     Browser* browser,
     content::WebContents* web_contents) {
   launcher_controller_->GetBrowserShortcutLauncherItemController()->
       SetShelfIDForBrowserWindowContents(browser, web_contents);
 }