Remove some unused cloud print histograms.

chrome/service/cloud_print/printer_job_handler.cc

 // 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.
 
 #include "chrome/service/cloud_print/printer_job_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_util.h"
 #include "base/json/json_reader.h"
@@ skipping 702 matching lines @@
 
   std::string tags_hash = GetHashOfPrinterInfo(printer_info);
   if (tags_hash != printer_info_cloud_.tags_hash) {
     printer_info_cloud_.tags_hash = tags_hash;
     post_data += GetPostDataForPrinterInfo(printer_info, mime_boundary);
     // Remove all the existing proxy tags.
     std::string cp_tag_wildcard(kCloudPrintServiceProxyTagPrefix);
     cp_tag_wildcard += ".*";
     net::AddMultipartValueForUpload(kPrinterRemoveTagValue,
         cp_tag_wildcard, mime_boundary, std::string(), &post_data);
-
-    if (!last_caps_update_time_.is_null()) {
-      UMA_HISTOGRAM_CUSTOM_TIMES(
-          "CloudPrint.CapsUpdateInterval",
-          base::Time::Now() - last_caps_update_time_,
-          base::TimeDelta::FromMilliseconds(1),
-          base::TimeDelta::FromDays(7), 50);
-    }
-    last_caps_update_time_ = base::Time::Now();
   }
 
   if (printer_info.printer_name != printer_info_.printer_name) {
     net::AddMultipartValueForUpload(kPrinterNameValue,
         printer_info.printer_name, mime_boundary, std::string(), &post_data);
   }
   if (printer_info.printer_description != printer_info_.printer_description) {
     net::AddMultipartValueForUpload(kPrinterDescValue,
       printer_info.printer_description, mime_boundary,
       std::string(), &post_data);
@@ skipping 67 matching lines @@
                            this)) {
     OnJobSpoolFailed();
   }
 }
 
 bool PrinterJobHandler::CurrentlyOnPrintThread() const {
   return print_thread_.task_runner()->BelongsToCurrentThread();
 }
 
 }  // namespace cloud_print