Don't deref stale AutofillMetrics pointer in AutofillCCInfoBarDelegate

chrome/browser/autofill/autofill_cc_infobar_delegate.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_AUTOFILL_AUTOFILL_CC_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_AUTOFILL_AUTOFILL_CC_INFOBAR_DELEGATE_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
@@ skipping 26 matching lines @@
     return scoped_ptr<ConfirmInfoBarDelegate>(
         new AutofillCCInfoBarDelegate(metric_logger, save_card_callback));
   }
 #endif
 
  private:
   AutofillCCInfoBarDelegate(const AutofillMetrics* metric_logger,
                             const base::Closure& save_card_callback);
   ~AutofillCCInfoBarDelegate() override;
 
-  void LogUserAction(AutofillMetrics::InfoBarMetric user_action);
-
   // ConfirmInfoBarDelegate:
   void InfoBarDismissed() override;
   int GetIconID() const override;
   Type GetInfoBarType() const override;
   bool ShouldExpireInternal(const NavigationDetails& details) const override;
   base::string16 GetMessageText() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
   bool Accept() override;
   bool Cancel() override;
   base::string16 GetLinkText() const override;
   bool LinkClicked(WindowOpenDisposition disposition) override;
 
   // For logging UMA metrics.
   // Weak reference. Owned by the AutofillManager that initiated this infobar.
+  // May be stale during shutdown!
   const AutofillMetrics* metric_logger_;
 
   // The callback to save credit card if the user accepts the infobar.
   base::Closure save_card_callback_;
 
   // Did the user ever explicitly accept or dismiss this infobar?
   bool had_user_interaction_;
 
   FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest, CreditCardInfoBar);
 
   DISALLOW_COPY_AND_ASSIGN(AutofillCCInfoBarDelegate);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_AUTOFILL_AUTOFILL_CC_INFOBAR_DELEGATE_H_