Compile print_preview, part 2: reduce down to 260 errors

ui/webui/resources/js/cr/event_target.js

Index: ui/webui/resources/js/cr/event_target.js
diff --git a/ui/webui/resources/js/cr/event_target.js b/ui/webui/resources/js/cr/event_target.js
index 96d157a6b07483650e843252e4e77b469f06c582..0d6fbd58adef11a886e548167ea7cd59456e0613 100644
--- a/ui/webui/resources/js/cr/event_target.js
+++ b/ui/webui/resources/js/cr/event_target.js
@@ -13,6 +13,7 @@ cr.define('cr', function() {
    * Creates a new EventTarget. This class implements the DOM level 2
    * EventTarget interface and can be used wherever those are used.
    * @constructor
+   * @implements {EventTarget}

[Dan Beam, 2014/09/23 00:46:34]

this is a confusing statement.  i assume this means that it implements
EventTarget provided by the browser, not itself?

[Vitaly Pavlenko, 2014/09/23 01:05:17]

Yes, all our constructors are visible to Closure compiler only by their
full-qualified names. Sometimes I need to add a constructor to the list of
exported entities just to use it inside JSDoc in the same file where it's
declared. So here it's definitely EventTarget coming from compiler externs.

    */
   function EventTarget() {
   }