Move FS related mojo methods to ArcFileSystemInstance.

chrome/browser/chromeos/arc/fileapi/intent_helper_util.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_FILEAPI_INTENT_HELPER_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_INTENT_HELPER_UTIL_H_
 
 #include "components/arc/common/intent_helper.mojom.h"
 #include "url/gurl.h"
 
 namespace arc {
 namespace intent_helper_util {
 
-// Utility which posts a task to run IntentHelperInstance::GetFileSize.
+using GetFileSizeCallback =
+    mojom::IntentHelperInstance::GetFileSizeDeprecatedCallback;
+using OpenFileToReadCallback =
+    mojom::IntentHelperInstance::OpenFileToReadDeprecatedCallback;
+
+// Utility which posts a task to run GetFileSize.
 // This function must be called on the IO thread.
-void GetFileSizeOnIOThread(
-    const GURL& arc_url,
-    const mojom::IntentHelperInstance::GetFileSizeCallback& callback);
+void GetFileSizeOnIOThread(const GURL& arc_url,
+                           const GetFileSizeCallback& callback);
 
-// Utility which posts a task to run IntentHelperInstance::OpenFileToRead.
+// Utility which posts a task to run OpenFileToRead.
 // This function must be called on the IO thread.
-void OpenFileToReadOnIOThread(
-    const GURL& arc_url,
-    const mojom::IntentHelperInstance::OpenFileToReadCallback& callback);
+void OpenFileToReadOnIOThread(const GURL& arc_url,
+                              const OpenFileToReadCallback& callback);
 
 }  // namespace intent_helper_util
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_INTENT_HELPER_UTIL_H_