Return unique_ptrs from base::ProcessMetrics.

chrome/browser/prerender/prerender_contents.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.
 
 #include "chrome/browser/prerender/prerender_contents.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <functional>
 #include <utility>
 
 #include "base/bind.h"
+#include "base/process/process_metrics.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/history/history_tab_helper.h"
 #include "chrome/browser/prerender/prerender_field_trial.h"
 #include "chrome/browser/prerender/prerender_final_status.h"
 #include "chrome/browser/prerender/prerender_handle.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "chrome/browser/prerender/prerender_resource_throttle.h"
@@ skipping 578 matching lines @@
   prerender_manager_->AddToHistory(this);
   prerender_manager_->MoveEntryToPendingDelete(this, final_status);
 
   if (!prerender_manager_->IsControlGroup() && prerendering_has_started())
     NotifyPrerenderStop();
 }
 
 base::ProcessMetrics* PrerenderContents::MaybeGetProcessMetrics() {
   if (!process_metrics_) {
     // If a PrenderContents hasn't started prerending, don't be fully formed.
-    if (!GetRenderViewHost() || !GetRenderViewHost()->GetProcess())
-      return NULL;
-    base::ProcessHandle handle = GetRenderViewHost()->GetProcess()->GetHandle();
+    const RenderViewHost* rvh = GetRenderViewHost();
+    if (!rvh)
+      return nullptr;
+
+    const content::RenderProcessHost* rph = rvh->GetProcess();
+    if (!rph)
+      return nullptr;
+
+    base::ProcessHandle handle = rph->GetHandle();
     if (handle == base::kNullProcessHandle)
-      return NULL;
+      return nullptr;
+
 #if !defined(OS_MACOSX)
-    process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(handle));
+    process_metrics_ = base::ProcessMetrics::CreateProcessMetrics(handle);
 #else
-    process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(
-        handle,
-        content::BrowserChildProcessHost::GetPortProvider()));
+    process_metrics_ = base::ProcessMetrics::CreateProcessMetrics(
+        handle, content::BrowserChildProcessHost::GetPortProvider());
 #endif
   }
 
   return process_metrics_.get();
 }
 
 void PrerenderContents::DestroyWhenUsingTooManyResources() {
   base::ProcessMetrics* metrics = MaybeGetProcessMetrics();
   if (!metrics)
     return;
@@ skipping 79 matching lines @@
 void PrerenderContents::AddResourceThrottle(
     const base::WeakPtr<PrerenderResourceThrottle>& throttle) {
   resource_throttles_.push_back(throttle);
 }
 
 void PrerenderContents::AddNetworkBytes(int64_t bytes) {
   network_bytes_ += bytes;
 }
 
 }  // namespace prerender