Fix header guards in //chrome

chrome/browser/ui/views/apps/app_window_native_widget_mac.h

Index: chrome/browser/ui/views/apps/app_window_native_widget_mac.h
diff --git a/chrome/browser/ui/views/apps/app_window_native_widget_mac.h b/chrome/browser/ui/views/apps/app_window_native_widget_mac.h
index 61c1f18d09fad2a48d1ca38b152cf58aefe5d741..5efecd5de2c8569dc9d55dfe248dc29c32b8c2a9 100644
--- a/chrome/browser/ui/views/apps/app_window_native_widget_mac.h
+++ b/chrome/browser/ui/views/apps/app_window_native_widget_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_UI_VIEWS_APPS_APP_WINDOW_NATIVE_WIDGET_MAC_H
-#define CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_NATIVE_WIDGET_MAC_H
+#ifndef CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_NATIVE_WIDGET_MAC_H_
+#define CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_NATIVE_WIDGET_MAC_H_
 
 #include "base/macros.h"
 #include "ui/views/widget/native_widget_mac.h"
@@ -33,4 +33,4 @@ class AppWindowNativeWidgetMac : public views::NativeWidgetMac {
   DISALLOW_COPY_AND_ASSIGN(AppWindowNativeWidgetMac);
 };
 
-#endif  // CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_NATIVE_WIDGET_MAC_H
+#endif  // CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_NATIVE_WIDGET_MAC_H_