s/\bArc\b/ARC/g for ARC related code.

chrome/browser/ui/app_list/arc/arc_app_dialog.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_DIALOG_H_
 #define CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_DIALOG_H_
 
 #include <string>
 
 #include "base/callback.h"
 
 class AppListControllerDelegate;
 class Profile;
 
 namespace arc {
 
-// Shows a dialog for user to confirm uninstallation of Arc app.
-// Currently, Arc app can only be manually uninstalled from AppList. But it
+// Shows a dialog for user to confirm uninstallation of ARC app.
+// Currently, ARC app can only be manually uninstalled from AppList. But it
 // would be simple to enable the dialog to shown from other source.
 void ShowArcAppUninstallDialog(Profile* profile,
                                AppListControllerDelegate* controller,
                                const std::string& app_id);
 
 // Test purpose methods.
 bool IsArcAppDialogViewAliveForTest();
 
 bool CloseAppDialogViewAndConfirmForTest(bool confirm);
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_DIALOG_H_