remove DownloadController::SetDefaultDownloadFileName()

chrome/browser/android/download/download_controller.cc

Index: chrome/browser/android/download/download_controller.cc
diff --git a/chrome/browser/android/download/download_controller.cc b/chrome/browser/android/download/download_controller.cc
index 337b8ab62358f9e4b403d26def62ed649ef237f2..024bef0718bdd1001c17c26e3100384d629670b5 100644
--- a/chrome/browser/android/download/download_controller.cc
+++ b/chrome/browser/android/download/download_controller.cc
@@ -217,11 +217,6 @@ void DownloadController::AcquireFileAccessPermission(
       RequestFileAccess(callback_id);
 }
 
-void DownloadController::SetDefaultDownloadFileName(
-    const std::string& file_name) {
-  default_file_name_ = file_name;
-}
-
 bool DownloadController::HasFileAccessPermission(
     ui::WindowAndroid* window_android) {
   ScopedJavaLocalRef<jobject> jwindow_android = window_android->GetJavaObject();