Allow blank spaces before colon (:) on CSS variable definition
https://bugs.webkit.org/show_bug.cgi?id=115802

Reviewed by Darin Adler.

Source/WebCore:

Test: css3/css-variable-definition.html

Modified the grammar to allow blank spaces before the colon on CSS
variable definitions.

* css/CSSGrammar.y.in:

LayoutTests:

New test to check that spaces are allowed before the color on CSS
variable definitions.

* css3/css-variable-definition-expected.html: Added.
* css3/css-variable-definition.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149740 268f45cc-cd09-0410-ab3c-d52691b4dbfc