Fix header guards in //chrome

chrome/browser/apps/app_shim/test/app_shim_host_manager_test_api_mac.h

Index: chrome/browser/apps/app_shim/test/app_shim_host_manager_test_api_mac.h
diff --git a/chrome/browser/apps/app_shim/test/app_shim_host_manager_test_api_mac.h b/chrome/browser/apps/app_shim/test/app_shim_host_manager_test_api_mac.h
index 241a8a6f8ae7c6fb4f5268217557cd32d9e0f140..0e2d2f8db12cd3b17473b1700e8ae631ffe719bd 100644
--- a/chrome/browser/apps/app_shim/test/app_shim_host_manager_test_api_mac.h
+++ b/chrome/browser/apps/app_shim/test/app_shim_host_manager_test_api_mac.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 CHROME_BROWSER_APPS_APP_SHIM_TEST_APP_SHIM_HOST_MANAGER_TEST_API_MAC_H
-#define CHROME_BROWSER_APPS_APP_SHIM_TEST_APP_SHIM_HOST_MANAGER_TEST_API_MAC_H
+#ifndef CHROME_BROWSER_APPS_APP_SHIM_TEST_APP_SHIM_HOST_MANAGER_TEST_API_MAC_H_
+#define CHROME_BROWSER_APPS_APP_SHIM_TEST_APP_SHIM_HOST_MANAGER_TEST_API_MAC_H_
 
 #include <memory>
 
@@ -41,4 +41,4 @@ class AppShimHostManagerTestApi {
 
 }  // namespace test
 
-#endif  // CHROME_BROWSER_APPS_APP_SHIM_TEST_APP_SHIM_HOST_MANAGER_TEST_API_MAC_H
+#endif  // CHROME_BROWSER_APPS_APP_SHIM_TEST_APP_SHIM_HOST_MANAGER_TEST_API_MAC_H_