fix build due to mdv -> template_binding rename
fix build due to mdv -> template_binding rename

BUG=

Review URL: https://codereview.chromium.org//35683006

git-svn-id: b50203376db0bced10cb74915ae3e7a3ab7c1213@29058 260f80e4-7a28-3924-810f-c04153c831b5

dart-archive/polymer-expressions,dart-archive/polymer-expressions