MD Settings: Add remapping options for Backspace and Escape

chrome/browser/resources/settings/device_page/compiled_resources2.gyp

 # Copyright 2016 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': 'device_page',
       'dependencies': [
         '../compiled_resources2.gyp:route',
         '../settings_page/compiled_resources2.gyp:settings_animated_pages',
@@ skipping 15 matching lines @@
       'dependencies': [
         'device_page_browser_proxy'
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'keyboard',
       'dependencies': [
         '../compiled_resources2.gyp:route',
         '../prefs/compiled_resources2.gyp:prefs_types',
+        '../controls/compiled_resources2.gyp:settings_dropdown_menu',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:assert',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:load_time_data',
         '<(EXTERNS_GYP):settings_private',
         'device_page_browser_proxy'
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'stylus',
@@ skipping 63 matching lines @@
     {
       'target_name': 'drive_cache_dialog',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:i18n_behavior',
         '<(EXTERNS_GYP):chrome_send',
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
  ],
 }