Move WebAXObjectProxy and AccessibleController from CppBoundClass to gin::Wrappable

gin/gin.gyp

 # Copyright 2013 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,
   },
   'targets': [
     {
@@ skipping 42 matching lines @@
         'per_isolate_data.cc',
         'per_isolate_data.h',
         'public/context_holder.h',
         'public/gin_embedders.h',
         'public/isolate_holder.h',
         'public/wrapper_info.h',
         'runner.cc',
         'runner.h',
         'try_catch.cc',
         'try_catch.h',
+        'unsafe_persistent.h',
         'wrappable.cc',
         'wrappable.h',
         'wrapper_info.cc',
       ],
     },
     {
       'target_name': 'gin_shell',
       'type': 'executable',
       'dependencies': [
         '../base/base.gyp:base',
@@ skipping 43 matching lines @@
         'converter_unittest.cc',
         'modules/timer_unittest.cc',
         'test/run_all_unittests.cc',
         'test/run_js_tests.cc',
         'runner_unittest.cc',
         'wrappable_unittest.cc',
       ],
     },
   ],
 }