Enable "Hide Extension" option when "Save Link As" on the Mac

chrome/browser/download/download_target_determiner.cc

Index: chrome/browser/download/download_target_determiner.cc
diff --git a/chrome/browser/download/download_target_determiner.cc b/chrome/browser/download/download_target_determiner.cc
index 99bcd7f1e855e09c96b958c6277aeda025c8f3dd..17bb22dc1343abd0c10acdb89104b50eb8c58335 100644
--- a/chrome/browser/download/download_target_determiner.cc
+++ b/chrome/browser/download/download_target_determiner.cc
@@ -95,6 +95,7 @@ DownloadTargetDeterminer::DownloadTargetDeterminer(
       is_dangerous_file_(false),
       virtual_path_(initial_virtual_path),
       is_filetype_handled_safely_(false),
+      hide_file_extension_(false),
       download_(download),
       is_resumption_(download_->GetLastReason() !=
                          content::DOWNLOAD_INTERRUPT_REASON_NONE &&
@@ -335,7 +336,7 @@ DownloadTargetDeterminer::Result
 }
 
 void DownloadTargetDeterminer::PromptUserForDownloadPathDone(
-    const base::FilePath& virtual_path) {
+    const base::FilePath& virtual_path, bool hide_file_extension) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DVLOG(20) << "User selected path:" << virtual_path.AsUTF8Unsafe();
   if (virtual_path.empty()) {
@@ -346,6 +347,7 @@ void DownloadTargetDeterminer::PromptUserForDownloadPathDone(
 
   virtual_path_ = virtual_path;
   download_prefs_->SetSaveFilePath(virtual_path_.DirName());
+  hide_file_extension_ = hide_file_extension;
   DoLoop();
 }
 
@@ -735,6 +737,7 @@ void DownloadTargetDeterminer::ScheduleCallbackAndDeleteSelf() {
   target_info->intermediate_path = intermediate_path_;
   target_info->mime_type = mime_type_;
   target_info->is_filetype_handled_safely = is_filetype_handled_safely_;
+  target_info->hide_file_extension = hide_file_extension_;
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(completion_callback_, base::Passed(&target_info)));