No need to recalc style before StyleResolver::computeFont.

No need to recalc style before StyleResolver::computeFont.

StyleResolver::computeFont does not rely on the computed style of any
elements in the document tree. The updateLayoutTree call was there to
avoid an assert due to an unnecessary composed tree traversal for a
parent node. That traversal was removed by [1], so the updateLayoutTree
call should no longer be needed.

This change gets rid of synchronous style recalcs when FontFaceSet.load()
is called.

[1] https://codereview.chromium.org/1367743002/

BUG=536625
Committed: https://crrev.com/dc369a994337bd2c92948bf4d27d1549c063d6c2
Cr-Commit-Position: refs/heads/master@{#351025}

[rune, 2015-09-27 15:41:41]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2015-09-27 15:41:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1372823002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1372823002/1

[rune, 2015-09-27 15:45:08]

rune@opera.com changed reviewers:
+ kojii@chromium.org

[commit-bot: I haz the power, 2015-09-27 16:54:19]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-27 16:54:19]

Dry run: This issue passed the CQ dry run.

[kojii, 2015-09-28 01:08:40]

lgtm, thank you for fixing this in much better way.

[rune, 2015-09-28 05:07:36]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2015-09-28 05:07:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1372823002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1372823002/1

[commit-bot: I haz the power, 2015-09-28 05:12:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-28 05:13:27]

Patchset 1 (id:??) landed as
https://crrev.com/dc369a994337bd2c92948bf4d27d1549c063d6c2
Cr-Commit-Position: refs/heads/master@{#351025}