Remove NetworkTimeTracker.UpdateTimeFetchAttempted histogram

components/network_time/network_time_tracker.cc

 // Copyright 2014 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 "components/network_time/network_time_tracker.h"
 
 #include <stdint.h>
 #include <string>
 #include <utility>
 
@@ skipping 356 matching lines @@
       std::unique_ptr<net::URLFetcherResponseWriter>(
           new SizeLimitingStringWriter(max_response_size_)));
   DCHECK(getter_);
   time_fetcher_->SetRequestContext(getter_.get());
   // Not expecting any cookies, but just in case.
   time_fetcher_->SetLoadFlags(net::LOAD_BYPASS_CACHE | net::LOAD_DISABLE_CACHE |
                               net::LOAD_DO_NOT_SAVE_COOKIES |
                               net::LOAD_DO_NOT_SEND_COOKIES |
                               net::LOAD_DO_NOT_SEND_AUTH_DATA);
 
-  UMA_HISTOGRAM_BOOLEAN("NetworkTimeTracker.UpdateTimeFetchAttempted", true);
-
   time_fetcher_->Start();
   fetch_started_ = tick_clock_->NowTicks();
 
   timer_.Stop();  // Restarted in OnURLFetchComplete().
 }
 
 bool NetworkTimeTracker::UpdateTimeFromResponse() {
   if (time_fetcher_->GetStatus().status() != net::URLRequestStatus::SUCCESS ||
       time_fetcher_->GetResponseCode() != 200) {
     DVLOG(1) << "fetch failed, status=" << time_fetcher_->GetStatus().status()
@@ skipping 87 matching lines @@
   base::Time network_time;
   if (!GetNetworkTime(&network_time, nullptr)) {
     return true;
   }
 
   // Otherwise, make the decision at random.
   return base::RandDouble() < RandomQueryProbability();
 }
 
 }  // namespace network_time