remove DownloadController::SetDefaultDownloadFileName()

chrome/browser/android/download/download_controller_base.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_ANDROID_DOWNLOAD_DOWNLOAD_CONTROLLER_BASE_H_
 #define CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_CONTROLLER_BASE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 70 matching lines @@
 
   // Called to prompt the user for file access permission. When finished,
   // |callback| will be executed.
   virtual void AcquireFileAccessPermission(
       content::WebContents* web_contents,
       const AcquireFileAccessPermissionCallback& callback) = 0;
 
   // Called by unit test to approve or disapprove file access request.
   virtual void SetApproveFileAccessRequestForTesting(bool approve) {}
 
-  // Called to set the default download file name if it cannot be resolved
-  // from url and content disposition
-  virtual void SetDefaultDownloadFileName(const std::string& file_name) {}
-
  protected:
   ~DownloadControllerBase() override {}
   static DownloadControllerBase* download_controller_;
 };
 
 #endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_CONTROLLER_BASE_H_