Convert bitfields to bool in SelectorChecker.

Convert bitfields to bool in SelectorChecker.

These objects are always created on the stack, and we only ever create
at most depth of the tree of them so we don't need to save a couple
bytes using a bitfield. The bitfield also means we end up doing extra
bit operations every time we read.

R=rune@opera.com

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=194641

[esprehn, 2015-04-28 23:31:35]

esprehn@chromium.org changed reviewers:
+ pdr@chromium.org, timloh@chromium.org

[pdr., 2015-04-29 00:11:33]

LGTM

[esprehn, 2015-04-29 00:29:30]

The CQ bit was checked by esprehn@chromium.org

[commit-bot: I haz the power, 2015-04-29 00:29:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1106183007/1

[commit-bot: I haz the power, 2015-04-29 01:50:52]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=194641