Remove some unused cloud print histograms.

chrome/service/cloud_print/printer_job_handler.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_SERVICE_CLOUD_PRINT_PRINTER_JOB_HANDLER_H_
 #define CHROME_SERVICE_CLOUD_PRINT_PRINTER_JOB_HANDLER_H_
 
 #include <list>
 #include <string>
 #include <vector>
@@ skipping 285 matching lines @@
   using JobStatusUpdaterList = std::list<scoped_refptr<JobStatusUpdater>>;
   JobStatusUpdaterList job_status_updater_list_;
 
   // Manages parsing the job queue
   PrinterJobQueueHandler job_queue_handler_;
 
   base::TimeTicks last_job_fetch_time_;
 
   base::Time job_start_time_;
   base::Time spooling_start_time_;
-  base::Time last_caps_update_time_;
 
   base::WeakPtrFactory<PrinterJobHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrinterJobHandler);
 };
 
 }  // namespace cloud_print
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_PRINTER_JOB_HANDLER_H_