goog.ui.media.FlashObject isLoaded fails in IE11

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Create and render an instance of a FlashObject in IE11
2. Address issue #630 so that FlashObject renders properly
3. Call isLoaded() on the FlashObject instance

What is the expected output? What do you see instead?
.isLoaded will always return false in IE11.  It should return true once the 
object is loaded.

Please provide any additional information below.
isLoaded contains two different tests to determine whether the FlashObject is 
loaded.  Both fail in IE 11.
    if (this.getFlashElement().readyState &&
        this.getFlashElement().readyState ==
            goog.ui.media.FlashObject.SwfReadyStates_.COMPLETE) {
      return true;
    }
This fails because COMPLETE is defined as Number(4) while readyState in IE 11 
will return "complete" when the flash object is loaded.

    if (this.getFlashElement().PercentLoaded &&
        this.getFlashElement().PercentLoaded() == 100) {
      return true;
    }
This fails because testing for the existence of the PercentLoaded function 
returns false, even though actually calling it will return successfully.

Changing the first test to the following appears to work although it results in 
a type mismatch warning from the compiler.
    switch (this.getFlashElement().readyState) {
      case goog.ui.media.FlashObject.SwfReadyStates_.COMPLETE:
      case 'complete':
        return true;
    }

Original issue reported on code.google.com by andrew.c...@period7.com on 19 Mar 2014 at 9:11