Convert //base to use std::unique_ptr

base/metrics/sparse_histogram.cc

Index: base/metrics/sparse_histogram.cc
diff --git a/base/metrics/sparse_histogram.cc b/base/metrics/sparse_histogram.cc
index ee18cfa6b15ffb0b69b56604ac17529cddd1a9bb..1118c4149ef95f6c8e734ef7fca3646b58b8c50c 100644
--- a/base/metrics/sparse_histogram.cc
+++ b/base/metrics/sparse_histogram.cc
@@ -6,6 +6,7 @@
 
 #include <utility>
 
+#include "base/memory/ptr_util.h"
 #include "base/metrics/metrics_hashes.h"
 #include "base/metrics/persistent_histogram_allocator.h"
 #include "base/metrics/persistent_sample_map.h"
@@ -37,7 +38,7 @@ HistogramBase* SparseHistogram::FactoryGet(const std::string& name,
     // allocating from it fails, code below will allocate the histogram from
     // the process heap.
     PersistentMemoryAllocator::Reference histogram_ref = 0;
-    scoped_ptr<HistogramBase> tentative_histogram;
+    std::unique_ptr<HistogramBase> tentative_histogram;
     PersistentHistogramAllocator* allocator =
         PersistentHistogramAllocator::GetGlobalAllocator();
     if (allocator) {
@@ -79,12 +80,12 @@ HistogramBase* SparseHistogram::FactoryGet(const std::string& name,
 }
 
 // static
-scoped_ptr<HistogramBase> SparseHistogram::PersistentCreate(
+std::unique_ptr<HistogramBase> SparseHistogram::PersistentCreate(
     PersistentMemoryAllocator* allocator,
     const std::string& name,
     HistogramSamples::Metadata* meta,
     HistogramSamples::Metadata* logged_meta) {
-  return make_scoped_ptr(
+  return WrapUnique(
       new SparseHistogram(allocator, name, meta, logged_meta));
 }
 
@@ -123,16 +124,16 @@ void SparseHistogram::AddCount(Sample value, int count) {
   FindAndRunCallback(value);
 }
 
-scoped_ptr<HistogramSamples> SparseHistogram::SnapshotSamples() const {
-  scoped_ptr<SampleMap> snapshot(new SampleMap(name_hash()));
+std::unique_ptr<HistogramSamples> SparseHistogram::SnapshotSamples() const {
+  std::unique_ptr<SampleMap> snapshot(new SampleMap(name_hash()));
 
   base::AutoLock auto_lock(lock_);
   snapshot->Add(*samples_);
   return std::move(snapshot);
 }
 
-scoped_ptr<HistogramSamples> SparseHistogram::SnapshotDelta() {
-  scoped_ptr<SampleMap> snapshot(new SampleMap(name_hash()));
+std::unique_ptr<HistogramSamples> SparseHistogram::SnapshotDelta() {
+  std::unique_ptr<SampleMap> snapshot(new SampleMap(name_hash()));
   base::AutoLock auto_lock(lock_);
   snapshot->Add(*samples_);
 
@@ -219,7 +220,7 @@ void SparseHistogram::WriteAsciiImpl(bool graph_it,
                                      const std::string& newline,
                                      std::string* output) const {
   // Get a local copy of the data so we are consistent.
-  scoped_ptr<HistogramSamples> snapshot = SnapshotSamples();
+  std::unique_ptr<HistogramSamples> snapshot = SnapshotSamples();
   Count total_count = snapshot->TotalCount();
   double scaled_total_count = total_count / 100.0;
 
@@ -232,7 +233,7 @@ void SparseHistogram::WriteAsciiImpl(bool graph_it,
   // normalize the graphical bar-width relative to that sample count.
   Count largest_count = 0;
   Sample largest_sample = 0;
-  scoped_ptr<SampleCountIterator> it = snapshot->Iterator();
+  std::unique_ptr<SampleCountIterator> it = snapshot->Iterator();
   while (!it->Done()) {
     Sample min;
     Sample max;