Use native implementation of dangerous download infobar

chrome/browser/android/download/mock_download_controller.cc

Index: chrome/browser/android/download/mock_download_controller.cc
diff --git a/chrome/browser/android/download/mock_download_controller.cc b/chrome/browser/android/download/mock_download_controller.cc
index df198c6cd9a9c5dc6ef1241ae896207a74511397..1df9ec8b0fdd24d08250ae85bdf02bf5bcd2083b 100644
--- a/chrome/browser/android/download/mock_download_controller.cc
+++ b/chrome/browser/android/download/mock_download_controller.cc
@@ -27,11 +27,6 @@ void MockDownloadController::StartContextMenuDownload(
     bool is_link, const std::string& extra_headers) {
 }
 
-void MockDownloadController::DangerousDownloadValidated(
-    content::WebContents* web_contents,
-    const std::string& download_guid,
-    bool accept) {}
-
 void MockDownloadController::AcquireFileAccessPermission(
     content::WebContents* web_contents,
     const DownloadControllerBase::AcquireFileAccessPermissionCallback& cb) {