Fix the SSL interstitial UMA stats

chrome/browser/ssl/ssl_blocking_page.h

 // 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.
 
 #ifndef CHROME_BROWSER_SSL_SSL_BLOCKING_PAGE_H_
 #define CHROME_BROWSER_SSL_SSL_BLOCKING_PAGE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 53 matching lines @@
   // Used to query the HistoryService to see if the URL is in history. For UMA.
   void OnGotHistoryCount(HistoryService::Handle handle,
                          bool success,
                          int num_visits,
                          base::Time first_visit);
 
   base::Callback<void(bool)> callback_;
 
   content::WebContents* web_contents_;
   int cert_error_;
-  base::TimeTicks display_start_time_;
   net::SSLInfo ssl_info_;
   GURL request_url_;
   // Could the user successfully override the error?
   bool overridable_;
   // Has the site requested strict enforcement of certificate errors?
   bool strict_enforcement_;
   content::InterstitialPage* interstitial_page_;  // Owns us.
   // Is the hostname for an internal network?
   bool internal_;
   // How many times is this same URL in history?
   int num_visits_;
   // Used for getting num_visits_.
   CancelableRequestConsumer request_consumer_;
 
   // For the FieldTrial: this contains the name of the condition.
   std::string trialCondition_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLBlockingPage);
 };
 
 #endif  // CHROME_BROWSER_SSL_SSL_BLOCKING_PAGE_H_