Remove remoting.ClientPlugin interface

remoting/webapp/all_js_load.gtestjs

 // 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.
 
 /**
  * Test fixture for loading all our JS files.
  * @constructor
  * @extends {testing.Test}
  */
 function AllJsLoadTest () {
 }
 
 AllJsLoadTest.prototype = {
   __proto__: testing.Test.prototype,
 
   /** @inheritDoc */
   extraLibraries: [
     'browser_globals.gtestjs',
     // All of our Javascript files should be listed here unless they are
     // only used by JSCompiler
-    'client_plugin_async.js',
     'client_plugin.js',
     'client_screen.js',
     'client_session.js',
     //'clipboard_event_proto.js',  // Only used by jscompiler.
     'clipboard.js',
     'connection_history.js',
     'connection_stats.js',
     //'cs_oauth2_trampoline.js', // Uses globals in the chrome namespace, which
                                  // give a compilation error when declared in
                                  // browser_globals for some reason. Since this
@@ skipping 35 matching lines @@
     'wcs_sandbox_container.js',
     'xhr.js',
     'xhr_proxy.js',
   ],
 };
 
 // Basic test to verify that all the JS files load without console errors.
 TEST_F('AllJsLoadTest', 'TestNoConsoleErrors', function() {
   assertTrue(true);
 });