Fix a couple of scroll-related issues:

remoting/webapp/window_frame.js

Index: remoting/webapp/window_frame.js
diff --git a/remoting/webapp/window_frame.js b/remoting/webapp/window_frame.js
index 6aa32b03e193309aa73136f8378132182db93cbe..71a905bdb1e56eb1ee34d29719eccd6065c3797d 100644
--- a/remoting/webapp/window_frame.js
+++ b/remoting/webapp/window_frame.js
@@ -110,12 +110,10 @@ remoting.WindowFrame.prototype.setClientSession = function(clientSession) {
   this.clientSession_ = clientSession;
   var windowTitle = document.head.querySelector('title');
   if (this.clientSession_) {
-    document.body.classList.add('connected');
     this.title_.innerText = clientSession.getHostDisplayName();
     windowTitle.innerText = clientSession.getHostDisplayName() + ' - ' +
         chrome.i18n.getMessage(/*i18n-content*/'PRODUCT_NAME');
   } else {
-    document.body.classList.remove('connected');
     this.title_.innerHTML = ' ';
     windowTitle.innerText =
         chrome.i18n.getMessage(/*i18n-content*/'PRODUCT_NAME');