[Chromoting] Change Application.Delegate to proper subclass of Application.

remoting/webapp/browser_test/bump_scroll_browser_test.js

Index: remoting/webapp/browser_test/bump_scroll_browser_test.js
diff --git a/remoting/webapp/browser_test/bump_scroll_browser_test.js b/remoting/webapp/browser_test/bump_scroll_browser_test.js
index 734e6adf3235a1d6292a91c1486782a76d4e321c..a90d5b17711a488258a58321df9cbf667d979c04 100644
--- a/remoting/webapp/browser_test/bump_scroll_browser_test.js
+++ b/remoting/webapp/browser_test/bump_scroll_browser_test.js
@@ -58,7 +58,8 @@ browserTest.FakeDesktopViewport.prototype.raiseEvent =
 
 /** @return {remoting.DesktopViewport} */
 function getViewportForTesting() {
-  var view = remoting.desktopDelegateForTesting.getConnectedViewForTesting();
+  var desktopApp = /** @type {remoting.DesktopRemoting} */ (remoting.app);
+  var view = desktopApp.getConnectedViewForTesting();
   if (view) {
     return view.getViewportForTesting();
   }
@@ -343,4 +344,4 @@ browserTest.Bump_Scroll.prototype.verifyNoScroll =
     Promise.resolve(true);
   }
   return this.verifyScroll(undefined, undefined, desktopViewport);
-};
+};