Return unique_ptrs from base::ProcessMetrics.

chrome/browser/performance_monitor/process_metrics_history.cc

 // Copyright 2013 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 "chrome/browser/performance_monitor/process_metrics_history.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 18 matching lines @@
 }  // namespace
 
 // If a process is consistently above this CPU utilization percentage over time,
 // we consider it as high and may take action.
 const float kHighCPUUtilizationThreshold = 90.0f;
 
 ProcessMetricsHistory::ProcessMetricsHistory()
     : last_update_sequence_(0), cpu_usage_(0.0), trace_trigger_handle_(-1) {
 }
 
-ProcessMetricsHistory::ProcessMetricsHistory(
-    const ProcessMetricsHistory& other) = default;
-
 ProcessMetricsHistory::~ProcessMetricsHistory() {
 }
 
 void ProcessMetricsHistory::Initialize(
     const ProcessMetricsMetadata& process_data,
     int initial_update_sequence) {
   DCHECK_EQ(base::kNullProcessHandle, process_data_.handle);
   process_data_ = process_data;
   last_update_sequence_ = initial_update_sequence;
 
 #if defined(OS_MACOSX)
-  process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(
+  process_metrics_ = base::ProcessMetrics::CreateProcessMetrics(
       process_data_.handle,
-      content::BrowserChildProcessHost::GetPortProvider()));
+      content::BrowserChildProcessHost::GetPortProvider());
 #else
-  process_metrics_.reset(
-      base::ProcessMetrics::CreateProcessMetrics(process_data_.handle));
+  process_metrics_ =
+      base::ProcessMetrics::CreateProcessMetrics(process_data_.handle);
 #endif
 
   const char* trigger_name = NULL;
   switch (process_data_.process_type) {
     case content::PROCESS_TYPE_BROWSER:
       trigger_name = kBrowserProcessTrigger;
       break;
     case content::PROCESS_TYPE_GPU:
       trigger_name = kGPUProcessTrigger;
       break;
@@ skipping 99 matching lines @@
 
   if (cpu_usage_ > kHighCPUUtilizationThreshold &&
       trace_trigger_handle_ != -1) {
     content::BackgroundTracingManager::GetInstance()->TriggerNamedEvent(
         trace_trigger_handle_,
         content::BackgroundTracingManager::StartedFinalizingCallback());
   }
 }
 
 }  // namespace performance_monitor