Switch to use download GUID to indentify download items

chrome/browser/android/download/mock_download_controller_android.h

Index: chrome/browser/android/download/mock_download_controller_android.h
diff --git a/chrome/browser/android/download/mock_download_controller_android.h b/chrome/browser/android/download/mock_download_controller_android.h
index 50e621e735086b596139b73166b3a0dc9b79e11f..d74e7dfe6c524ced40e82635016cc7efa6bdfffa 100644
--- a/chrome/browser/android/download/mock_download_controller_android.h
+++ b/chrome/browser/android/download/mock_download_controller_android.h
@@ -33,9 +33,9 @@ class MockDownloadControllerAndroid
       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;