Convert //base to use std::unique_ptr

base/metrics/persistent_sample_map.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.
 
 // PersistentSampleMap implements HistogramSamples interface. It is used
 // by the SparseHistogram class to store samples in persistent memory which
 // allows it to be shared between processes or live across restarts.
 
 #ifndef BASE_METRICS_PERSISTENT_SAMPLE_MAP_H_
 #define BASE_METRICS_PERSISTENT_SAMPLE_MAP_H_
 
 #include <stdint.h>
 
 #include <map>
+#include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram_base.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/persistent_memory_allocator.h"
 
 namespace base {
 
 // The logic here is similar to that of SampleMap but with different data
 // structures. Changes here likely need to be duplicated there.
 class BASE_EXPORT PersistentSampleMap : public HistogramSamples {
  public:
   PersistentSampleMap(uint64_t id,
                       PersistentMemoryAllocator* allocator,
                       Metadata* meta);
   ~PersistentSampleMap() override;
 
   // HistogramSamples:
   void Accumulate(HistogramBase::Sample value,
                   HistogramBase::Count count) override;
   HistogramBase::Count GetCount(HistogramBase::Sample value) const override;
   HistogramBase::Count TotalCount() const override;
-  scoped_ptr<SampleCountIterator> Iterator() const override;
+  std::unique_ptr<SampleCountIterator> Iterator() const override;
 
  protected:
   // Performs arithemetic. |op| is ADD or SUBTRACT.
   bool AddSubtractImpl(SampleCountIterator* iter, Operator op) override;
 
   // Gets a pointer to a "count" corresponding to a given |value|. Returns NULL
   // if sample does not exist.
   HistogramBase::Count* GetSampleCountStorage(HistogramBase::Sample value);
 
   // Gets a pointer to a "count" corresponding to a given |value|, creating
@@ skipping 19 matching lines @@
   // The persistent memory allocator holding samples and an iterator through it.
   PersistentMemoryAllocator* allocator_;
   PersistentMemoryAllocator::Iterator sample_iter_;
 
   DISALLOW_COPY_AND_ASSIGN(PersistentSampleMap);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_PERSISTENT_SAMPLE_MAP_H_