remoting: Fix JSCompiler issues blocking ES6 transition.

remoting/webapp/browser_test/bump_scroll_browser_test.js

 // 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.
 
 /**
  * @fileoverview
  * @suppress {checkTypes}
  * Browser test for the scenario below:
  * 1. Enter full-screen mode
  * 2. Move the mouse to each edge; verify that the desktop bump-scrolls.
@@ skipping 33 matching lines @@
     function() {
   return this.pluginPosition_;
 };
 
 /** @return {base.EventSource} */
 browserTest.FakeDesktopViewport.prototype.getBumpScrollerForTesting =
     function() {
   return this.bumpScroller_;
 };
 
+/** @suppress {reportUnknownTypes} */
 browserTest.FakeDesktopViewport.prototype.raiseEvent =
     function() {
   return this.bumpScroller_.raiseEvent.apply(this.bumpScroller_, arguments);
 };
 
 /** @return {remoting.DesktopViewport} */
 function getViewportForTesting() {
   var desktopApp = /** @type {remoting.DesktopRemoting} */ (remoting.app);
   var view = desktopApp.getConnectedViewForTesting();
   if (view) {
@@ skipping 283 matching lines @@
  */
 browserTest.Bump_Scroll.prototype.verifyNoScroll =
     function(opt_desktopViewport) {
   var desktopViewport = opt_desktopViewport || getViewportForTesting();
   var bumpScroller = desktopViewport.getBumpScrollerForTesting();
   if (!bumpScroller) {
     Promise.resolve(true);
   }
   return this.verifyScroll(undefined, undefined, desktopViewport);
 };