PM: Make header guards comply with Google style.

BUG=None
TEST=None

Change-Id: I5cdbddb5233e5408a6e5b6d511b2e2e06a2a566c
Reviewed-on: https://chromium-review.googlesource.com/189209
Reviewed-by: Gilad Arnold <garnold@chromium.org>
Commit-Queue: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
diff --git a/policy_manager/pmtest_utils.h b/policy_manager/pmtest_utils.h
index 6adfec4..ade85d8 100644
--- a/policy_manager/pmtest_utils.h
+++ b/policy_manager/pmtest_utils.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_PMTEST_UTILS_H
-#define CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_PMTEST_UTILS_H
+#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_PMTEST_UTILS_H_
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_PMTEST_UTILS_H_
 
 // Convenience macros for checking null-ness of pointers.
 //
@@ -20,4 +20,4 @@
 #define PMTEST_EXPECT_NULL(p) EXPECT_EQ(NULL, p)
 #define PMTEST_EXPECT_NOT_NULL(p) EXPECT_NE(reinterpret_cast<void*>(NULL), p)
 
-#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_PMTEST_UTILS_H
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_PMTEST_UTILS_H_