update_engine: Replace scoped_ptr with std::unique_ptr.

BUG=None
TEST=`FEATURES=test emerge-$BOARD update_engine`
TEST=`USE='clang asan' FEATURES=test emerge-$BOARD update_engine`

Change-Id: I55a2f7f53675faaac20ba25f72ed52cf938d7744
Reviewed-on: https://chromium-review.googlesource.com/224189
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/update_manager/real_system_provider.h b/update_manager/real_system_provider.h
index c040855..9081d94 100644
--- a/update_manager/real_system_provider.h
+++ b/update_manager/real_system_provider.h
@@ -5,8 +5,7 @@
 #ifndef UPDATE_ENGINE_UPDATE_MANAGER_REAL_SYSTEM_PROVIDER_H_
 #define UPDATE_ENGINE_UPDATE_MANAGER_REAL_SYSTEM_PROVIDER_H_
 
-#include <base/memory/scoped_ptr.h>
-
+#include <memory>
 #include <string>
 
 #include "update_engine/hardware_interface.h"
@@ -41,10 +40,10 @@
   }
 
  private:
-  scoped_ptr<Variable<bool>> var_is_normal_boot_mode_;
-  scoped_ptr<Variable<bool>> var_is_official_build_;
-  scoped_ptr<Variable<bool>> var_is_oobe_complete_;
-  scoped_ptr<Variable<bool>> var_is_boot_device_removable_;
+  std::unique_ptr<Variable<bool>> var_is_normal_boot_mode_;
+  std::unique_ptr<Variable<bool>> var_is_official_build_;
+  std::unique_ptr<Variable<bool>> var_is_oobe_complete_;
+  std::unique_ptr<Variable<bool>> var_is_boot_device_removable_;
 
   chromeos_update_engine::HardwareInterface* hardware_;