Move ProtocolExtensionManager from SessionConnector into its own class

remoting/remoting_webapp_files.gypi

 # 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.
 
 {
   'variables': {
 
     # Jscompile proto files.
     # These provide type information for jscompile.
     'remoting_webapp_js_proto_files': [
@@ skipping 51 matching lines @@
     ],
     # The unit test cases for the webapp
     'remoting_webapp_unittests_js_files': [
       # TODO(jrw): Move spy_promise to base.
       'webapp/unittests/spy_promise.js',
       'webapp/unittests/spy_promise_unittest.js',
       'webapp/base/js/base_unittest.js',
       'webapp/base/js/base_event_hook_unittest.js',
       'webapp/base/js/base_inherits_unittest.js',
       'webapp/base/js/ipc_unittest.js',
+      'webapp/base/js/protocol_extension_manager_unittest.js',
       'webapp/crd/js/apps_v2_migration_unittest.js',
       'webapp/crd/js/desktop_viewport_unittest.js',
       'webapp/crd/js/dns_blackhole_checker_unittest.js',
       'webapp/crd/js/error_unittest.js',
       'webapp/crd/js/fallback_signal_strategy_unittest.js',
       'webapp/crd/js/gcd_client_unittest.js',
       'webapp/crd/js/gcd_client_with_mock_xhr_unittest.js',
       'webapp/crd/js/host_table_entry_unittest.js',
       'webapp/crd/js/identity_unittest.js',
       'webapp/crd/js/l10n_unittest.js',
@@ skipping 80 matching lines @@
       'webapp/crd/js/video_frame_recorder.js',
     ],
     # Remoting core JavaScript files.
     'remoting_webapp_js_core_files': [
       'webapp/base/js/app_capabilities.js',
       'webapp/base/js/application.js',
       'webapp/base/js/base.js',
       'webapp/base/js/input_dialog.js',
       'webapp/base/js/ipc.js',
       'webapp/base/js/platform.js',
+      'webapp/base/js/protocol_extension_manager.js',
       'webapp/base/js/protocol_extension.js',
       'webapp/crd/js/apps_v2_migration.js',
       'webapp/crd/js/error.js',
       'webapp/crd/js/event_handlers.js',
       'webapp/crd/js/plugin_settings.js',
       'webapp/crd/js/remoting.js',
       'webapp/crd/js/typecheck.js',
       'webapp/crd/js/xhr.js',
       'webapp/crd/js/gcd_client.js',
     ],
@@ skipping 284 matching lines @@
       '<(remoting_webapp_template_background)',
       '<(remoting_webapp_template_main)',
       '<(remoting_webapp_template_message_window)',
       '<(remoting_webapp_template_wcs_sandbox)',
       '<@(remoting_webapp_template_files)',
       '<@(remoting_webapp_crd_js_files)',
     ],
 
   },
 }