Switch to use download GUID to indentify download items

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"
@@ skipping 15 matching lines @@
   ~MockDownloadControllerAndroid() override;
 
   // DownloadControllerAndroid implementation.
   void CreateGETDownload(int render_process_id, int render_view_id,
                          int request_id) 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, int download_id,
-      bool accept) 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_