Remove mutable from members in CSSSelector.

Remove mutable from members in CSSSelector.

This was mutable from back when pseudoType() used to also compute the
pseudoType and update m_match as well. Now we do that inside
updatePseudoType inside the parser so we don't need mutable members.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196636

[esprehn, 2015-06-06 21:31:21]

The CQ bit was checked by esprehn@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-06 21:31:34]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167523005/1

[esprehn, 2015-06-06 22:19:28]

esprehn@chromium.org changed reviewers:
+ ojan@chromium.org, sashab@chromium.org, timloh@chromium.org

[commit-bot: I haz the power, 2015-06-07 00:05:05]

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

[commit-bot: I haz the power, 2015-06-07 00:05:06]

Dry run: This issue passed the CQ dry run.

[rune, 2015-06-07 21:23:22]

rune@opera.com changed reviewers:
+ rune@opera.com

[rune, 2015-06-07 21:23:23]

lgtm

[esprehn, 2015-06-07 21:37:15]

The CQ bit was checked by esprehn@chromium.org

[commit-bot: I haz the power, 2015-06-07 21:37:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167523005/1

[commit-bot: I haz the power, 2015-06-07 21:40:57]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196636