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Original submission is the first patch, fixes are the second. There were two issues with the original- - Issue with URI sanitization where relative URIs on IE were being dropped. - Analyzer issue on missing members for CustomElement. BUG= R=jmesserly@google.com Review URL: https://codereview.chromium.org//23525003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@26757 260f80e4-7a28-3924-810f-c04153c831b5