base: Use std::move() instead of Pass() for real movable types.

base/metrics/histogram.cc

 // 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.
 
 // Histogram is an object that aggregates statistics, and can summarize them in
 // various forms, including ASCII graphical, HTML, and numerically (as a
 // vector of numbers corresponding to each of the aggregating buckets).
 // See header file for details and examples.
 
 #include "base/metrics/histogram.h"
@@ skipping 275 matching lines @@
   if (count <= 0) {
     NOTREACHED();
     return;
   }
   samples_->Accumulate(value, count);
 
   FindAndRunCallback(value);
 }
 
 scoped_ptr<HistogramSamples> Histogram::SnapshotSamples() const {
-  return SnapshotSampleVector().Pass();
+  return SnapshotSampleVector();
 }
 
 void Histogram::AddSamples(const HistogramSamples& samples) {
   samples_->Add(samples);
 }
 
 bool Histogram::AddSamplesFromPickle(PickleIterator* iter) {
   return samples_->AddFromPickle(iter);
 }
 
@@ skipping 80 matching lines @@
   if (!ValidateRangeChecksum(*histogram, range_checksum)) {
     // The serialized histogram might be corrupted.
     return NULL;
   }
   return histogram;
 }
 
 scoped_ptr<SampleVector> Histogram::SnapshotSampleVector() const {
   scoped_ptr<SampleVector> samples(new SampleVector(bucket_ranges()));
   samples->Add(*samples_);
-  return samples.Pass();
+  return samples;
 }
 
 void Histogram::WriteAsciiImpl(bool graph_it,
                                const std::string& newline,
                                std::string* output) const {
   // Get local (stack) copies of all effectively volatile class data so that we
   // are consistent across our output activities.
   scoped_ptr<SampleVector> snapshot = SnapshotSampleVector();
   Count sample_count = snapshot->TotalCount();
 
@@ skipping 484 matching lines @@
 
   BucketRanges* bucket_ranges = new BucketRanges(ranges.size());
   for (size_t i = 0; i < ranges.size(); i++) {
     bucket_ranges->set_range(i, ranges[i]);
   }
   bucket_ranges->ResetChecksum();
   return bucket_ranges;
 }
 
 }  // namespace base