We have a problem in the process on destroying WebContentsImpl because

chrome/browser/autofill/content_autofill_driver_browsertest.cc

 // Copyright 2014 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 "base/memory/scoped_ptr.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/url_constants.h"
@@ skipping 63 matching lines @@
 
 }  // namespace
 
 class ContentAutofillDriverBrowserTest : public InProcessBrowserTest,
                                          public content::WebContentsObserver {
  public:
   ContentAutofillDriverBrowserTest() {}
   virtual ~ContentAutofillDriverBrowserTest() {}
 
   virtual void SetUpOnMainThread() OVERRIDE {
-    web_contents_ = browser()->tab_strip_model()->GetActiveWebContents();
-    ASSERT_TRUE(web_contents_ != NULL);
-    Observe(web_contents_);
+    content::WebContents* web_contents =
+        browser()->tab_strip_model()->GetActiveWebContents();
+    ASSERT_TRUE(web_contents != NULL);
+    Observe(web_contents);
     AutofillManager::RegisterProfilePrefs(manager_delegate_.GetPrefRegistry());
 
     autofill_driver_.reset(
-        new TestContentAutofillDriver(web_contents_, &manager_delegate_));
+        new TestContentAutofillDriver(web_contents, &manager_delegate_));
   }
 
   // Normally the WebContents will automatically delete the driver, but here
   // the driver is owned by this test, so we have to manually destroy.
-  virtual void WebContentsDestroyed(content::WebContents* web_contents)
-      OVERRIDE {
-    DCHECK_EQ(web_contents_, web_contents);
+  virtual void WebContentsDestroyed() OVERRIDE {
     autofill_driver_.reset();
   }
 
   virtual void WasHidden() OVERRIDE {
     if (!web_contents_hidden_callback_.is_null())
       web_contents_hidden_callback_.Run();
   }
 
   virtual void NavigationEntryCommitted(
       const content::LoadCommittedDetails& load_details) OVERRIDE {
@@ skipping 46 matching lines @@
   browser()->OpenURL(content::OpenURLParams(GURL(chrome::kChromeUIAboutURL),
                                             content::Referrer(),
                                             CURRENT_TAB,
                                             content::PAGE_TRANSITION_TYPED,
                                             false));
   runner->Run();
   nav_entry_committed_callback_.Reset();
 }
 
 }  // namespace autofill