GitLab

Add the HTML import for IronButtonState and IronControlState because
these become the JS import after the conversion.  These are used by the
`auto_imports` in the BUILD.gn.

Move the <link> tag inside the <template> because this is enforced by
polymer_modulizer() this requires changing from rel="import" to normal
rel="stylesheet" which in turn requires to changed the URL to request
the CSS.

Remove build target "closure_compile_externs" because it had empty
sources and externs_list, thus not checking anything.

Bug: 1133186
Change-Id: I96b7e475b7099465186f94615f2564c2548adddb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2520480Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825254}