app_list: Fix the header include guards.

chrome/browser/ui/ash/app_list/extension_app_item.h

Index: chrome/browser/ui/ash/app_list/extension_app_item.h
diff --git a/chrome/browser/ui/ash/app_list/extension_app_item.h b/chrome/browser/ui/ash/app_list/extension_app_item.h
index 800cf2e266d5a51c1e185a0bafa1c1e27a3d558f..2ca5fb58b0bb19816b18b67c895a6c1b1984315d 100644
--- a/chrome/browser/ui/ash/app_list/extension_app_item.h
+++ b/chrome/browser/ui/ash/app_list/extension_app_item.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_ASH_APP_LIST_EXTENSION_APP_ITEM_H_
-#define CHROME_BROWSER_UI_VIEWS_ASH_APP_LIST_EXTENSION_APP_ITEM_H_
+#ifndef CHROME_BROWSER_UI_ASH_APP_LIST_EXTENSION_APP_ITEM_H_
+#define CHROME_BROWSER_UI_ASH_APP_LIST_EXTENSION_APP_ITEM_H_
 
 #include <string>
 
@@ -71,4 +71,4 @@ class ExtensionAppItem : public ChromeAppListItem,
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppItem);
 };
 
-#endif  // CHROME_BROWSER_UI_VIEWS_ASH_APP_LIST_EXTENSION_APP_ITEM_H_
+#endif  // CHROME_BROWSER_UI_ASH_APP_LIST_EXTENSION_APP_ITEM_H_