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This CL makes two changes to the autocapitalize IDL behavior to match the new
spec:
https://html.spec.whatwg.org/multipage/interaction.html#autocapitalization

- For elements with no autocapitalize attribute set, or which have the attribute
  set with an empty value (e.g. <input autocapitalize> or <input
  autocapitalize="">), return an empty string instead of "sentences".

- All <input> elements will now have the same behavior. Email, URL, and password
  inputs will no longer be special-cased to always return "none".

This CL also adds some test cases for this new behavior.

Bug: 776618
Change-Id: I4027e81380d5ff7ea7da254b98cfa67b1d202b58
Reviewed-on: https://chromium-review.googlesource.com/872012
Commit-Queue: Ryan Landay <rlanday@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531323}