Added ordering warnings back for CSSValueKeywords.in

Added ordering warnings back for CSSValueKeywords.in, since the order
in this file must match the order in CSSParserFastPaths until the fast
paths file is generated.

BUG=665272

Review-Url: https://codereview.chromium.org/2537393002
Cr-Commit-Position: refs/heads/master@{#435541}
1 file changed