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

chrome/browser/chromeos/arc/arc_auth_context.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_CHROMEOS_ARC_ARC_AUTH_CONTEXT_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_CONTEXT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 49 matching lines @@
   void OnRefreshTokenTimeout();
 
   void StartFetchers();
   void ResetFetchers();
 
   // Unowned pointer.
   ProfileOAuth2TokenService* token_service_;
   std::string account_id_;
 
   // Owned by content::BrowserContent. Used to isolate cookies for auth server
-  // communication and shared with Arc OptIn UI platform app.
+  // communication and shared with ARC OptIn UI platform app.
   content::StoragePartition* storage_partition_ = nullptr;
 
   PrepareCallback callback_;
   bool context_prepared_ = false;
 
   base::OneShotTimer refresh_token_timeout_;
   std::unique_ptr<GaiaAuthFetcher> merger_fetcher_;
   std::unique_ptr<UbertokenFetcher> ubertoken_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcAuthContext);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_CONTEXT_H_