update_engine: Run clang-format on ./ (root directory)

BUG=none
TEST=unittest

Change-Id: Ibd075dc7ea9a18e798f612e35725f1c83c112809
Reviewed-on: https://chromium-review.googlesource.com/1409708
Commit-Ready: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Sen Jiang <senj@chromium.org>
diff --git a/power_manager_interface.h b/power_manager_interface.h
index be059ec..8f77650 100644
--- a/power_manager_interface.h
+++ b/power_manager_interface.h
@@ -40,7 +40,7 @@
 namespace power_manager {
 // Factory function which create a PowerManager.
 std::unique_ptr<PowerManagerInterface> CreatePowerManager();
-}
+}  // namespace power_manager
 
 }  // namespace chromeos_update_engine