Change Audio and Video support detection method for Safari3.

Safari3 incorrectly reports that audio/video are supported when using !!element.play, but correctly reports that audio/video are not supported using
!!element.canPlayType. This was verified to work and pass tests on the following versions of Safari: Safari 3.2.1, Safari 4.0.5, and Safari 5.0.4.

Review at http://gwt-code-reviews.appspot.com/1423802


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10008 8db76d5a-ed1c-0410-87a9-c151d255dfc7
2 files changed