Add _mac suffix for obj-c files.

browser/atom_application_mac.h

@@ -0,0 +1,23 @@
+// Copyright (c) 2013 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "base/mac/scoped_sending_event.h"
+
+@interface AtomApplication : NSApplication<CrAppProtocol,
+                                           CrAppControlProtocol> {
+ @private
+  BOOL handlingSendEvent_;
+}
+
+// CrAppProtocol:
+- (BOOL)isHandlingSendEvent;
+
+// CrAppControlProtocol:
+- (void)setHandlingSendEvent:(BOOL)handlingSendEvent;
+
++ (AtomApplication*)sharedApplication;
+
+- (IBAction)closeAllWindows:(id)sender;
+
+@end