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

content/browser/download/base_file.h

Index: content/browser/download/base_file.h
diff --git a/content/browser/download/base_file.h b/content/browser/download/base_file.h
index 9016755ebc65d95ee6c7fa4e78192ee81821f015..f8ebc5fb5b638f78ebc4fae225e106c9e8effe1a 100644
--- a/content/browser/download/base_file.h
+++ b/content/browser/download/base_file.h
@@ -107,6 +107,10 @@ class CONTENT_EXPORT BaseFile {
 
   virtual std::string DebugString() const;
 
+  // Sets whether the BaseFile should hide its file extension when presented in
+  // the Finder (MacOSX).
+  void set_hide_file_extension(bool hide_file_extension);
+
  private:
   friend class BaseFileTest;
   FRIEND_TEST_ALL_PREFIXES(BaseFileTest, IsEmptyHash);
@@ -181,6 +185,8 @@ class CONTENT_EXPORT BaseFile {
 
   net::BoundNetLog bound_net_log_;
 
+  bool hide_file_extension_;
+
   DISALLOW_COPY_AND_ASSIGN(BaseFile);
 };