Part 2 of base::IDMap refactor to eliminate IDMapOwnPointer/IDMapExternalPointer modes

chrome/browser/metrics/subprocess_metrics_provider.h

 // Copyright 2016 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_BROWSER_METRICS_SUBPROCESS_METRICS_PROVIDER_H_
 #define CHROME_BROWSER_METRICS_SUBPROCESS_METRICS_PROVIDER_H_
 
 #include <memory>
 #include <set>
 
@@ skipping 80 matching lines @@
   static std::unique_ptr<base::PersistentHistogramAllocator>
   GetSubprocessHistogramAllocatorOnIOThread(int id);
 
   base::ThreadChecker thread_checker_;
 
   // Object for registing notification requests.
   content::NotificationRegistrar registrar_;
 
   // All of the shared-persistent-allocators for known sub-processes.
   using AllocatorByIdMap =
-      IDMap<base::PersistentHistogramAllocator, IDMapOwnPointer, int>;
+      IDMap<std::unique_ptr<base::PersistentHistogramAllocator>, int>;
   AllocatorByIdMap allocators_by_id_;
 
   // Track all observed render processes to un-observe them on exit.
   ScopedObserver<content::RenderProcessHost, SubprocessMetricsProvider>
       scoped_observer_;
 
   base::WeakPtrFactory<SubprocessMetricsProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SubprocessMetricsProvider);
 };
 
 #endif  // CHROME_BROWSER_METRICS_SUBPROCESS_METRICS_PROVIDER_H_