Remove dead code

atom/browser/native_window.h

@@ -24,10 +24,6 @@
 
 class SkRegion;
 
-namespace base {
-class CommandLine;
-}
-
 namespace brightray {
 class InspectableWebContents;
 }
@@ -187,9 +183,6 @@ class NativeWindow : public content::WebContentsObserver,
       content::WebContents*,
       const content::NativeWebKeyboardEvent& event) {}
 
-  // Called when renderer process is going to be started.
-  void AppendExtraCommandLineSwitches(base::CommandLine* command_line);
-
   // Public API used by platform-dependent delegates and observers to send UI
   // related notifications.
   void NotifyWindowClosed();