leak_detector: call transform() with back_inserter

components/metrics/leak_detector/leak_detector.cc

 // 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.
 
 #include "components/metrics/leak_detector/leak_detector.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 
@@ skipping 250 matching lines @@
         detector->last_analysis_alloc_size_ + analysis_interval_bytes) {
       // Try to maintain regular intervals of size |analysis_interval_bytes_|.
       detector->last_analysis_alloc_size_ =
           total_alloc_size - total_alloc_size % analysis_interval_bytes;
 
       InternalVector<InternalLeakReport> leak_reports;
       detector->impl_->TestForLeaks(&leak_reports);
 
       // Pass leak reports to observers.
       std::vector<MemoryLeakReportProto> leak_report_protos;
+      leak_report_protos.reserve(leak_reports.size());
       std::transform(leak_reports.begin(), leak_reports.end(),
-                     leak_report_protos.begin(), &ConvertLeakReportToProto);
+                     std::back_inserter(leak_report_protos),
+                     &ConvertLeakReportToProto);
       detector->NotifyObservers(leak_report_protos);
     }
   }
 
   {
     // The internal memory of |stack| should be freed before setting
     // |entered_hook| to false at the end of this function. Free it here by
     // moving the internal memory to a temporary variable that will go out of
     // scope.
     std::vector<void*> dummy_stack;
@@ skipping 43 matching lines @@
     return;
   }
 
   {
     base::AutoLock lock(observers_lock_);
     FOR_EACH_OBSERVER(Observer, observers_, OnLeaksFound(reports));
   }
 }
 
 }  // namespace metrics