If we show a SafeBrowsing warning we always send the client-side detection

chrome/browser/safe_browsing/client_side_detection_service.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.
 //
 // Helper class which handles communication with the SafeBrowsing backends for
 // client-side phishing detection.  This class is used to fetch the client-side
 // model and send it to all renderers.  This class is also used to send a ping
 // back to Google to verify if a particular site is really phishing or not.
 //
 // This class is not thread-safe and expects all calls to be made on the UI
@@ skipping 67 matching lines @@
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   // Sends a request to the SafeBrowsing servers with the ClientPhishingRequest.
   // The URL scheme of the |url()| in the request should be HTTP.  This method
   // takes ownership of the |verdict| as well as the |callback| and calls the
   // the callback once the result has come back from the server or if an error
   // occurs during the fetch.  If an error occurs the phishing verdict will
   // always be false.  The callback is always called after
   // SendClientReportPhishingRequest() returns and on the same thread as
-  // SendClientReportPhishingRequest() was called.
+  // SendClientReportPhishingRequest() was called.  You may set |callback| to
+  // NULL if you don't care about the server verdict.
   virtual void SendClientReportPhishingRequest(
       ClientPhishingRequest* verdict,
       ClientReportPhishingRequestCallback* callback);
 
   // Returns true if the given IP address string falls within a private
   // (unroutable) network block.  Pages which are hosted on these IP addresses
   // are exempt from client-side phishing detection.  This is called by the
   // ClientSideDetectionHost prior to sending the renderer a
   // SafeBrowsingMsg_StartPhishingDetection IPC.
   //
@@ skipping 162 matching lines @@
   // this map to speed up lookups.
   BadSubnetMap bad_subnets_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSideDetectionService);
 };
 }  // namepsace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_CLIENT_SIDE_DETECTION_SERVICE_H_