Require explicit selection of traits for LazyInstance

components/metrics/leak_detector/leak_detector.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 COMPONENTS_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_H_
 #define COMPONENTS_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <list>
 #include <memory>
 #include <vector>
 
 #include "base/feature_list.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "base/synchronization/lock.h"
 #include "base/task_runner.h"
 #include "base/threading/thread_checker.h"
 
 namespace base {
 template <typename T>
-struct DefaultLazyInstanceTraits;
+struct LazyInstanceTraitsBase;
 }
 
 namespace metrics {
 
 class MemoryLeakReportProto;
 class MemoryLeakReportProto_Params;
 
 namespace leak_detector {
 class LeakDetectorImpl;
 }
@@ skipping 42 matching lines @@
   static void InitTLSSlot();
 
   // Add |observer| to the list of stored Observers, i.e. |observers_|, to which
   // the leak detector will report leaks.
   void AddObserver(Observer* observer);
 
   // Remove |observer| from |observers_|.
   void RemoveObserver(Observer* observer);
 
  private:
-  friend base::DefaultLazyInstanceTraits<LeakDetector>;
+  friend base::LazyInstanceTraitsBase<LeakDetector>;
   FRIEND_TEST_ALL_PREFIXES(LeakDetectorTest, NotifyObservers);
 
   // Keep these private, as this class is meant to be initialized only through
   // the lazy instance, and never destroyed.
   LeakDetector();
   ~LeakDetector();
 
   // Allocator hook function that processes each alloc. Performs sampling and
   // unwinds call stack if necessary. Passes the allocated memory |ptr| and
   // allocation size |size| along with call stack info to RecordAlloc().
@@ skipping 52 matching lines @@
   // corresponds to the allowable range of |sampling_rate| passed in during
   // initialization: [0.0f, 1.0f] -> [0, UINT64_MAX].
   uint64_t sampling_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(LeakDetector);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_H_