Return unique_ptrs from base::ProcessMetrics.

base/process/process_metrics.h

Index: base/process/process_metrics.h
diff --git a/base/process/process_metrics.h b/base/process/process_metrics.h
index 57cb3abec0d20e3249d029da319c96f2e10ab58b..4f08a4f74fafc10c4090d68e2afd9c6fa22241a9 100644
--- a/base/process/process_metrics.h
+++ b/base/process/process_metrics.h
@@ -11,6 +11,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 
 #include "base/base_export.h"
@@ -103,22 +104,22 @@ class BASE_EXPORT ProcessMetrics {
   ~ProcessMetrics();
 
   // Creates a ProcessMetrics for the specified process.
-  // The caller owns the returned object.
 #if !defined(OS_MACOSX) || defined(OS_IOS)
-  static ProcessMetrics* CreateProcessMetrics(ProcessHandle process);
+  static std::unique_ptr<ProcessMetrics> CreateProcessMetrics(
+      ProcessHandle process);
 #else
 
   // The port provider needs to outlive the ProcessMetrics object returned by
   // this function. If NULL is passed as provider, the returned object
   // only returns valid metrics if |process| is the current process.
-  static ProcessMetrics* CreateProcessMetrics(ProcessHandle process,
-                                              PortProvider* port_provider);
+  static std::unique_ptr<ProcessMetrics> CreateProcessMetrics(
+      ProcessHandle process,
+      PortProvider* port_provider);
 #endif  // !defined(OS_MACOSX) || defined(OS_IOS)
 
   // Creates a ProcessMetrics for the current process. This a cross-platform
   // convenience wrapper for CreateProcessMetrics().
-  // The caller owns the returned object.
-  static ProcessMetrics* CreateCurrentProcessMetrics();
+  static std::unique_ptr<ProcessMetrics> CreateCurrentProcessMetrics();
 
   // Returns the current space allocated for the pagefile, in bytes (these pages
   // may or may not be in memory).  On Linux, this returns the total virtual