Simplify HTMLStyleElement.

Simplify HTMLStyleElement.

The parser will never insert more than one child into a <style>, so we don't
need explicit logic to batch up parsing. Once I removed that it exposed that
all the line number and parser created logic is from error reporting in the
parser that's been dead in Blink for over a year.

By doing this simplification I was able to remove the finishParsingChildren()
callback entirely.

R=eseidel@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/08a9c63f1a9f6259ce128e1273bc10d783951567

[esprehn, 2014-12-10 01:27:24]

esprehn@chromium.org changed reviewers:
+ eseidel@chromium.org, ojan@chromium.org

[eseidel, 2014-12-10 01:58:41]

lgtm

[esprehn, 2014-12-10 03:01:51]

Committed patchset #1 (id:1) manually as
08a9c63f1a9f6259ce128e1273bc10d783951567 (presubmit successful).