[Mojo] Remove static "bootstrap" state in mojo_js

mojo/mojo.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 288 matching lines @@
       'type': 'shared_library',
       'dependencies': [
         '../base/base.gyp:base',
         '../gin/gin.gyp:gin',
         'hello_world_service',
         'mojo_common_lib',
         'mojo_js_bindings',
         'mojo_system',
       ],
       'sources': [
-        'apps/js/bootstrap.cc',
-        'apps/js/bootstrap.h',
         'apps/js/main.cc',
         'apps/js/mojo_runner_delegate.cc',
         'apps/js/mojo_runner_delegate.h',
+        'apps/js/threading.cc',
+        'apps/js/threading.h',
       ],
     },
     {
       'target_name': 'sample_app',
       'type': 'shared_library',
       'dependencies': [
         '../base/base.gyp:base',
         '../ui/gl/gl.gyp:gl',
         'hello_world_service',
         'mojo_common_lib',
@@ skipping 232 matching lines @@
             'java_in_dir': '<(DEPTH)/mojo/shell/android/apk',
             'resource_dir': '<(DEPTH)/mojo/shell/android/apk/res',
             'native_lib_target': 'libmojo_shell',
           },
           'includes': [ '../build/java_apk.gypi' ],
         }
       ],
     }],
   ],
 }