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_state.h b/update_manager/real_state.h
index 1e2d10e..824656f 100644
--- a/update_manager/real_state.h
+++ b/update_manager/real_state.h
@@ -5,7 +5,7 @@
 #ifndef UPDATE_ENGINE_UPDATE_MANAGER_REAL_STATE_H_
 #define UPDATE_ENGINE_UPDATE_MANAGER_REAL_STATE_H_
 
-#include <base/memory/scoped_ptr.h>
+#include <memory>
 
 #include "update_engine/update_manager/state.h"
 
@@ -56,13 +56,13 @@
 
  private:
   // Instances of the providers.
-  scoped_ptr<ConfigProvider> config_provider_;
-  scoped_ptr<DevicePolicyProvider> device_policy_provider_;
-  scoped_ptr<RandomProvider> random_provider_;
-  scoped_ptr<ShillProvider> shill_provider_;
-  scoped_ptr<SystemProvider> system_provider_;
-  scoped_ptr<TimeProvider> time_provider_;
-  scoped_ptr<UpdaterProvider> updater_provider_;
+  std::unique_ptr<ConfigProvider> config_provider_;
+  std::unique_ptr<DevicePolicyProvider> device_policy_provider_;
+  std::unique_ptr<RandomProvider> random_provider_;
+  std::unique_ptr<ShillProvider> shill_provider_;
+  std::unique_ptr<SystemProvider> system_provider_;
+  std::unique_ptr<TimeProvider> time_provider_;
+  std::unique_ptr<UpdaterProvider> updater_provider_;
 };
 
 }  // namespace chromeos_update_manager