Fix TODO about ttc indicies.
Fix TODO about ttc indicies.

Creating a typeface from a stream using the old Skia interface now
supports ttc indexes. Update code to remove TODO.

BUG=chromium:381620

Review URL: https://codereview.chromium.org/857563003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@188553 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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