refactor: rename the atom directory to shell

shell/browser/mac/atom_application_delegate.h

@@ -0,0 +1,17 @@
+// Copyright (c) 2013 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#import <Cocoa/Cocoa.h>
+
+#import "atom/browser/ui/cocoa/atom_menu_controller.h"
+
+@interface AtomApplicationDelegate : NSObject <NSApplicationDelegate> {
+ @private
+  base::scoped_nsobject<AtomMenuController> menu_controller_;
+}
+
+// Sets the menu that will be returned in "applicationDockMenu:".
+- (void)setApplicationDockMenu:(atom::AtomMenuModel*)model;
+
+@end