Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

mojo/mojo_base.gyp

 # 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.
 
 # Essential components (and their tests) that are needed to build
 # Chrome should be here.  Other components that are useful only in
 # Mojo land like mojo_shell should be in mojo.gyp.
 {
   'includes': [
     '../third_party/mojo/mojo_variables.gypi',
@@ skipping 226 matching lines @@
         'shell/public/cpp/lib/app_lifetime_helper.cc',
         'shell/public/cpp/lib/application_delegate.cc',
         'shell/public/cpp/lib/application_impl.cc',
         'shell/public/cpp/lib/application_runner.cc',
         'shell/public/cpp/lib/interface_factory_connector.h',
         'shell/public/cpp/lib/service_connector_registry.cc',
         'shell/public/cpp/lib/service_connector_registry.h',
         'shell/public/cpp/lib/service_provider_impl.cc',
         'shell/public/cpp/lib/service_registry.cc',
         'shell/public/cpp/lib/service_registry.h',
+        'shell/public/cpp/shell.h',
         'shell/public/cpp/service_connector.h',
         'shell/public/cpp/service_provider_impl.h',
       ],
       'dependencies': [
         '../base/base.gyp:base_i18n',
         'mojo_application_bindings',
         'mojo_message_pump_lib',
         'mojo_services.gyp:network_type_converters',
       ],
     },
@@ skipping 111 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'mojo_common_unittests.isolate',
           ],
         },
       ],
     }],
   ]
 }