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It is easy now with import source closure. So, we can remove the temporary HAS_HTML_IMPORT result. R=brianwilkerson@google.com BUG= Review URL: https://codereview.chromium.org//1051023004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44919 260f80e4-7a28-3924-810f-c04153c831b5