Mac: Give app_shim code a nicer home

chrome/app_shim/app_mode_loader_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // On Mac, shortcuts can't have command-line arguments. Instead, produce small
 // app bundles which locate the Chromium framework and load it, passing the
 // appropriate data. This is the code for such an app bundle. It should be kept
 // minimal and do as little work as possible (with as much work done on
 // framework side as possible).
 
@@ skipping 186 matching lines @@
   // Hard coded info parameters.
   info.major_version = app_mode::kCurrentChromeAppModeInfoMajorVersion;
   info.minor_version = app_mode::kCurrentChromeAppModeInfoMinorVersion;
   info.argc = argc;
   info.argv = argv;
 
   // Exit instead of returning to avoid the the removal of |main()| from stack
   // backtraces under tail call optimization.
   exit(LoadFrameworkAndStart(&info));
 }