Convert //sandbox to use std::unique_ptr

sandbox/mac/os_compatibility.h

Index: sandbox/mac/os_compatibility.h
diff --git a/sandbox/mac/os_compatibility.h b/sandbox/mac/os_compatibility.h
index 4f18c34a5908a66fc1170df88bb074e5a7d282bb..c34188865fe9bac663cf9ef574de692b69cb40b4 100644
--- a/sandbox/mac/os_compatibility.h
+++ b/sandbox/mac/os_compatibility.h
@@ -15,9 +15,9 @@
 #include <mach/mach.h>
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 
-#include "base/memory/scoped_ptr.h"
 #include "sandbox/mac/message_server.h"
 
 namespace sandbox {
@@ -25,7 +25,7 @@ namespace sandbox {
 class OSCompatibility {
  public:
   // Creates an OSCompatibility instance for the current OS X version.
-  static scoped_ptr<OSCompatibility> CreateForPlatform();
+  static std::unique_ptr<OSCompatibility> CreateForPlatform();
 
   virtual ~OSCompatibility();