Convert //base to use std::unique_ptr

base/metrics/histogram_samples.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.
 
 #ifndef BASE_METRICS_HISTOGRAM_SAMPLES_H_
 #define BASE_METRICS_HISTOGRAM_SAMPLES_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/atomicops.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram_base.h"
 
 namespace base {
 
 class Pickle;
 class PickleIterator;
 class SampleCountIterator;
 
 // HistogramSamples is a container storing all samples of a histogram. All
 // elements must be of a fixed width to ensure 32/64-bit interoperability.
@@ skipping 37 matching lines @@
   virtual HistogramBase::Count GetCount(HistogramBase::Sample value) const = 0;
   virtual HistogramBase::Count TotalCount() const = 0;
 
   virtual void Add(const HistogramSamples& other);
 
   // Add from serialized samples.
   virtual bool AddFromPickle(PickleIterator* iter);
 
   virtual void Subtract(const HistogramSamples& other);
 
-  virtual scoped_ptr<SampleCountIterator> Iterator() const = 0;
+  virtual std::unique_ptr<SampleCountIterator> Iterator() const = 0;
   virtual bool Serialize(Pickle* pickle) const;
 
   // Accessor fuctions.
   uint64_t id() const { return meta_->id; }
   int64_t sum() const { return meta_->sum; }
   HistogramBase::Count redundant_count() const {
     return subtle::NoBarrier_Load(&meta_->redundant_count);
   }
 
  protected:
@@ skipping 30 matching lines @@
 
   // Get the index of current histogram bucket.
   // For histograms that don't use predefined buckets, it returns false.
   // Requires: !Done();
   virtual bool GetBucketIndex(size_t* index) const;
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_HISTOGRAM_SAMPLES_H_