Avoid calling hasAttribute() and then getAttribute() for performance

Avoid calling hasAttribute() and then getAttribute() for performance

Avoid calling hasAttribute() and then getAttribute() for performance.
This causes the attribute to be looked up (linear search) twice instead
of once if we call getAttribute() directly and then check if the returned
AtomicString is null.

R=eseidel@chromium.org, eseidel, rwlbuis

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168423

[eseidel, 2014-03-04 22:25:38]

lgtm

I doubt this matters much, but lgtm.

[commit-bot: I haz the power, 2014-03-04 22:26:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/183763033/1

[Inactive, 2014-03-05 03:13:28]

Committed patchset #2 manually as r168423 (presubmit successful).