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

content/browser/download/file_metadata_mac.h

Index: content/browser/download/file_metadata_mac.h
diff --git a/content/browser/download/file_metadata_mac.h b/content/browser/download/file_metadata_mac.h
index 19a3f07ff62a842c0550c45b450d741033b8f9e1..fc24e7f767b746e966ca613d78cbdb4285031225 100644
--- a/content/browser/download/file_metadata_mac.h
+++ b/content/browser/download/file_metadata_mac.h
@@ -5,6 +5,8 @@
 #ifndef CONTENT_BROWSER_DOWNLOAD_FILE_METADATA_MAC_H_
 #define CONTENT_BROWSER_DOWNLOAD_FILE_METADATA_MAC_H_
 
+#include "content/common/content_export.h"
+
 class GURL;
 
 namespace base {
@@ -26,6 +28,11 @@ void AddOriginMetadataToFile(const base::FilePath& file, const GURL& source,
 void AddQuarantineMetadataToFile(const base::FilePath& file, const GURL& source,
                                  const GURL& referrer);
 
+// Sets or clears the NSFileExtensionHidden property on |file|, which shows or
+// hides |file|'s file extension in the Finder.
+CONTENT_EXPORT void SetExtensionHiddenForFile(const base::FilePath& file,
+                                              bool hidden);
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_FILE_METADATA_MAC_H_