Reorganize apps/shell into app, browser and common directories

ash/ash.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 1033 matching lines @@
         'shell/example_factory.h',
         'shell/keyboard_controller_proxy_stub.cc',
         'shell/keyboard_controller_proxy_stub.h',
         'shell/lock_view.cc',
         'shell/panel_window.cc',
         'shell/panel_window.h',
         'shell/shelf_delegate_impl.cc',
         'shell/shelf_delegate_impl.h',
         'shell/shell_delegate_impl.cc',
         'shell/shell_delegate_impl.h',
-        'shell/shell_main.cc',
+        'shell/app/shell_main.cc',
         'shell/shell_main_parts.cc',
         'shell/shell_main_parts.h',
         'shell/toplevel_window.cc',
         'shell/toplevel_window.h',
         'shell/widgets.cc',
         'shell/window_type_launcher.cc',
         'shell/window_type_launcher.h',
         'shell/window_watcher.cc',
         'shell/window_watcher.h',
         'shell/window_watcher_shelf_item_delegate.cc',
         'shell/window_watcher_shelf_item_delegate.h',
         '../content/app/startup_helper_win.cc',
         '../ui/views/test/test_views_delegate.cc',
       ],
       'conditions': [
         ['OS=="win"', {
           'msvs_settings': {
             'VCLinkerTool': {
               'SubSystem': '2',  # Set /SUBSYSTEM:WINDOWS
             },
           },
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
       ],
     },
   ],
 }