[CSS Grid Layout] CSSParser should reject <track-list> without a <track-size>

[CSS Grid Layout] CSSParser should reject <track-list> without a <track-size>

The case of <track-list> without a <track-size> was properly handled
but that's because style resolution had to account for the parsing
being not totally right.

This refactoring will help with implementing parsing for
<repeat-function> as the code matches the specification more closely.

TEST=fast/css-grid-layout/named-grid-line-get-set.html

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=152914

[darktears, 2013-06-21 22:34:30]

On 2013/06/21 21:03:41, Julien Chaffraix wrote:

lgtm

[commit-bot: I haz the power, 2013-06-21 23:02:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jchaffraix@chromium.org/16917013/1

[commit-bot: I haz the power, 2013-06-22 00:41:27]

Change committed as 152914