[Chromoting] Move the onBlur handler from window to the plugin element.

remoting/webapp/remoting.js

Index: remoting/webapp/remoting.js
diff --git a/remoting/webapp/remoting.js b/remoting/webapp/remoting.js
index 26184d8fd89d3580d54780af2f051792ab3d77ab..384343f40b7a10c9dfbb0fb402a5a9d7b6cb4f40 100644
--- a/remoting/webapp/remoting.js
+++ b/remoting/webapp/remoting.js
@@ -53,7 +53,6 @@ remoting.init = function() {
     document.getElementById('current-email').innerText = email;
   }
 
-  window.addEventListener('blur', pluginLostFocus_, false);
   // The plugin's onFocus handler sends a paste command to |window|, because
   // it can't send one to the plugin element itself.
   window.addEventListener('paste', pluginGotPaste_, false);
@@ -150,16 +149,6 @@ function pluginGotPaste_(eventUncast) {
 }
 
 /**
- * Callback function called when the browser window loses focus. In this case,
- * release all keys to prevent them becoming 'stuck down' on the host.
- */
-function pluginLostFocus_() {
-  if (remoting.clientSession && remoting.clientSession.plugin) {
-    remoting.clientSession.plugin.releaseAllKeys();
-  }
-}
-
-/**
  * If the user is authenticated, but there is no email address cached, get one.
  */
 function refreshEmail_() {