Reland "Fix sandbox::PolicyBase leak"

sandbox/win/src/broker_services.h

Index: sandbox/win/src/broker_services.h
diff --git a/sandbox/win/src/broker_services.h b/sandbox/win/src/broker_services.h
index 919478c4f8a9856a1caf9150a07b0fb2536ae946..3474caaf4b40803f5d8abc51ed398888615e225d 100644
--- a/sandbox/win/src/broker_services.h
+++ b/sandbox/win/src/broker_services.h
@@ -45,10 +45,10 @@ class BrokerServicesBase final : public BrokerServices,
 
   // BrokerServices interface.
   ResultCode Init() override;
-  TargetPolicy* CreatePolicy() override;
+  scoped_refptr<TargetPolicy> CreatePolicy() override;
   ResultCode SpawnTarget(const wchar_t* exe_path,
                          const wchar_t* command_line,
-                         TargetPolicy* policy,
+                         scoped_refptr<TargetPolicy> policy,
                          ResultCode* last_warning,
                          DWORD* last_error,
                          PROCESS_INFORMATION* target) override;