Return unique_ptrs from base::ProcessMetrics.

chrome/browser/task_management/sampling/task_group_sampler.cc

Index: chrome/browser/task_management/sampling/task_group_sampler.cc
diff --git a/chrome/browser/task_management/sampling/task_group_sampler.cc b/chrome/browser/task_management/sampling/task_group_sampler.cc
index ca1c36ec9b1918f2e9f3c9fc37bf2bf9928e01c1..435bc70cab742729b513d616e5f23534711df2cc 100644
--- a/chrome/browser/task_management/sampling/task_group_sampler.cc
+++ b/chrome/browser/task_management/sampling/task_group_sampler.cc
@@ -8,6 +8,7 @@
 
 #include "base/bind.h"
 #include "base/callback.h"
+#include "base/process/process_metrics.h"
 #include "build/build_config.h"
 #include "chrome/browser/task_management/task_manager_observer.h"
 #include "content/public/browser/browser_child_process_host.h"
@@ -17,7 +18,8 @@ namespace task_management {
 
 namespace {
 
-base::ProcessMetrics* CreateProcessMetrics(base::ProcessHandle handle) {
+std::unique_ptr<base::ProcessMetrics> CreateProcessMetrics(
+    base::ProcessHandle handle) {
 #if !defined(OS_MACOSX)
   return base::ProcessMetrics::CreateProcessMetrics(handle);
 #else