Remove app_shell chrome.shell API and ShellAppWindow

extensions/shell/app_shell_resources.gyp

Index: extensions/shell/app_shell_resources.gyp
diff --git a/extensions/shell/app_shell_resources.gyp b/extensions/shell/app_shell_resources.gyp
deleted file mode 100644
index 162bd895191e3e6b46b61a77304e0b41d890daa1..0000000000000000000000000000000000000000
--- a/extensions/shell/app_shell_resources.gyp
+++ /dev/null
@@ -1,25 +0,0 @@
-# Copyright 2014 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.
-
-{
-  'targets': [
-    {
-      'target_name': 'app_shell_resources',
-      'type': 'none',
-      'variables': {
-        'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/extensions/shell',
-      },
-      'actions': [
-        {
-          'action_name': 'generate_app_shell_resources',
-          'variables': {
-            'grit_grd_file': 'app_shell_resources.grd',
-          },
-          'includes': [ '../../build/grit_action.gypi' ],
-        },
-      ],
-      'includes': [ '../../build/grit_target.gypi' ],
-    },
-  ]  # targets
-}