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As stated in the spec, <template> tag start token should set frameset-ok
flag to false when in in-body/in-head insertion mode.
https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inbody

BUG=475002

Review-Url: https://codereview.chromium.org/2135203002
Cr-Commit-Position: refs/heads/master@{#404632}