Break global impact of PersistentHistogramAllocator into a separate class.

components/metrics/metrics_service.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.
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
 // A MetricsService instance is typically created at application startup.  It is
@@ skipping 729 matching lines @@
   if (log_manager_.current_log()->num_events() > kEventLimit) {
     UMA_HISTOGRAM_COUNTS("UMA.Discarded Log Events",
                          log_manager_.current_log()->num_events());
     log_manager_.DiscardCurrentLog();
     OpenNewLog();  // Start trivial log to hold our histograms.
   }
 
   // If a persistent allocator is in use, update its internal histograms (such
   // as how much memory is being used) before reporting.
   base::PersistentHistogramAllocator* allocator =
-      base::PersistentHistogramAllocator::GetGlobalAllocator();
+      base::GlobalHistogramAllocator::Get();
   if (allocator)
     allocator->UpdateTrackingHistograms();
 
   // Put incremental data (histogram deltas, and realtime stats deltas) at the
   // end of all log transmissions (initial log handles this separately).
   // RecordIncrementalStabilityElements only exists on the derived
   // MetricsLog class.
   MetricsLog* current_log = log_manager_.current_log();
   DCHECK(current_log);
   RecordCurrentEnvironment(current_log);
@@ skipping 400 matching lines @@
                  base::Time::Now().ToTimeT());
 }
 
 void MetricsService::SkipAndDiscardUpload() {
   log_manager_.DiscardStagedLog();
   scheduler_->UploadCancelled();
   log_upload_in_progress_ = false;
 }
 
 }  // namespace metrics