Factor the extension loading code out of AccessibilityManager

chrome/chrome_browser_chromeos.gypi

 # 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': {
     # These files lists are shared with the GN build.
     'browser_chromeos_sources': [
         # All .cc, .h, .m, and .mm files under browser/chromeos, except for tests
         # and mocks.
+        'browser/chromeos/accessibility/accessibility_extension_loader.cc',
+        'browser/chromeos/accessibility/accessibility_extension_loader.h',
         'browser/chromeos/accessibility/accessibility_highlight_manager.cc',
         'browser/chromeos/accessibility/accessibility_highlight_manager.h',
         'browser/chromeos/accessibility/accessibility_manager.cc',
         'browser/chromeos/accessibility/accessibility_manager.h',
         'browser/chromeos/accessibility/accessibility_util.cc',
         'browser/chromeos/accessibility/accessibility_util.h',
         'browser/chromeos/accessibility/chromevox_panel.cc',
         'browser/chromeos/accessibility/chromevox_panel.h',
         'browser/chromeos/accessibility/magnification_manager.cc',
         'browser/chromeos/accessibility/magnification_manager.h',
@@ skipping 1370 matching lines @@
         'browser/chromeos/attestation/attestation_signed_data.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/attestation',
         'proto_out_dir': 'chrome/browser/chromeos/attestation',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }