Require explicit selection of traits for LazyInstance

base/metrics/statistics_recorder.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.
 
 // StatisticsRecorder holds all Histograms and BucketRanges that are used by
 // Histograms in the system. It provides a general place for
 // Histograms/BucketRanges to register, and supports a global API for accessing
 // (i.e., dumping, or graphing) the data.
 
 #ifndef BASE_METRICS_STATISTICS_RECORDER_H_
@@ skipping 199 matching lines @@
  private:
   // We keep a map of callbacks to histograms, so that as histograms are
   // created, we can set the callback properly.
   typedef std::map<std::string, OnSampleCallback> CallbackMap;
 
   // We keep all |bucket_ranges_| in a map, from checksum to a list of
   // |bucket_ranges_|.  Checksum is calculated from the |ranges_| in
   // |bucket_ranges_|.
   typedef std::map<uint32_t, std::list<const BucketRanges*>*> RangesMap;
 
-  friend struct DefaultLazyInstanceTraits<StatisticsRecorder>;
+  friend struct LazyInstanceTraitsBase<StatisticsRecorder>;
   friend class StatisticsRecorderTest;
 
   // Imports histograms from global persistent memory. The global lock must
   // not be held during this call.
   static void ImportGlobalPersistentHistograms();
 
   // The constructor just initializes static members. Usually client code should
   // use Initialize to do this. But in test code, you can friend this class and
   // call the constructor to get a clean StatisticsRecorder.
   StatisticsRecorder();
@@ skipping 25 matching lines @@
   // would do |if (!lock_) return;| which would race with
   // |lock_ = new Lock;| in StatisticsRecorder(). http://crbug.com/672852.
   static base::LazyInstance<base::Lock>::Leaky lock_;
 
   DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_STATISTICS_RECORDER_H_