If a download is initiated by download attribute, don't use stream viewer

chrome/browser/android/download/mock_download_controller_android.h

 // Copyright (c) 2015 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_MOCK_DOWNLOAD_CONTROLLER_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_DOWNLOAD_MOCK_DOWNLOAD_CONTROLLER_ANDROID_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "content/public/browser/android/download_controller_android.h"
 
 namespace content {
 class DownloadItem;
 class WebContents;
 }  // namespace content
 
 namespace chrome {
 namespace android {
 
 // Mock implementation of the DownloadControllerAndroid.
 class MockDownloadControllerAndroid
     : public content::DownloadControllerAndroid {
  public:
   MockDownloadControllerAndroid();
   ~MockDownloadControllerAndroid() override;
 
   // DownloadControllerAndroid implementation.
   void CreateGETDownload(int render_process_id, int render_view_id,
-                         int request_id) override;
+                         int request_id, bool mustDownload) override;
   void OnDownloadStarted(content::DownloadItem* download_item) override;
   void StartContextMenuDownload(
       const content::ContextMenuParams& params,
       content::WebContents* web_contents,
       bool is_link, const std::string& extra_headers) override;
   void DangerousDownloadValidated(content::WebContents* web_contents,
                                   const std::string& download_guid,
                                   bool accept) override;
   void AcquireFileAccessPermission(
       content::WebContents* web_contents,
       const AcquireFileAccessPermissionCallback& callback) override;
   void SetApproveFileAccessRequestForTesting(bool approve) override;
 
  private:
   bool approve_file_access_request_;
   DISALLOW_COPY_AND_ASSIGN(MockDownloadControllerAndroid);
 };
 
 }  // namespace android
 }  // namespace chrome
 
 
 #endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_MOCK_DOWNLOAD_CONTROLLER_ANDROID_H_