Stop pretending to support <string> for text-align.
https://bugs.webkit.org/show_bug.cgi?id=119107

Reviewed by Andreas Kling.

Source/WebCore: 

Test: fast/css/text-align-string-crash.html

* css/CSSParser.cpp:
(WebCore::CSSParser::parseValue):
Stop pretending to support <string> for text-align.

* css/DeprecatedStyleBuilder.cpp:
(WebCore::ApplyPropertyTextAlign::applyValue):
ASSERT that only value IDs get passed.

LayoutTests: 

* fast/css/text-align-string-crash-expected.txt: Added.
* fast/css/text-align-string-crash.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153399 268f45cc-cd09-0410-ab3c-d52691b4dbfc