Codestyle fixups to satisfy presubmits

This is a series of whitespace changes to align files created before
presubmit checks were enabled to match the presubmit checks that are
now in place on master.

Test: unit-tests
Change-Id: I52e769a3e7e6d390edfa067358a437f342e0e5d5
(cherry picked from commit 11d80256f35ba2995e88b129aaec9d8c7f302b7c)
diff --git a/update_manager/policy_test_utils.h b/update_manager/policy_test_utils.h
index 09b2550..5b93f7b 100644
--- a/update_manager/policy_test_utils.h
+++ b/update_manager/policy_test_utils.h
@@ -17,6 +17,7 @@
 #ifndef UPDATE_ENGINE_UPDATE_MANAGER_POLICY_TEST_UTILS_H_
 #define UPDATE_ENGINE_UPDATE_MANAGER_POLICY_TEST_UTILS_H_
 
+#include <memory>
 #include <string>
 
 #include <base/time/time.h>
@@ -32,7 +33,7 @@
 
 class UmPolicyTestBase : public ::testing::Test {
  protected:
-  explicit UmPolicyTestBase() = default;
+  UmPolicyTestBase() = default;
 
   void SetUp() override;
 
@@ -95,4 +96,4 @@
 
 }  // namespace chromeos_update_manager
 
-#endif  // UPDATE_ENGINE_UPDATE_MANAGER_POLICY_TEST_UTILS_H_
\ No newline at end of file
+#endif  // UPDATE_ENGINE_UPDATE_MANAGER_POLICY_TEST_UTILS_H_