[CSS3-Text] Adjust text-justify implementation to the latest spec
https://bugs.webkit.org/show_bug.cgi?id=135317

Reviewed by Darin Adler.

Source/WebCore:
Text-justify no longer accepts the following values: Inter-ideograph, inter-
cluster, and kashida. This patch removes them and updates the tests as well.

[1] http://dev.w3.org/csswg/css-text-3/#propdef-text-justify

Updated existing tests.

* css/CSSParser.cpp:
(WebCore::isValidKeywordPropertyAndValue):
* css/CSSPrimitiveValueMappings.h:
(WebCore::CSSPrimitiveValue::CSSPrimitiveValue):
(WebCore::CSSPrimitiveValue::operator TextJustify):
* css/CSSValueKeywords.in:
* rendering/style/RenderStyle.cpp:
(WebCore::RenderStyle::changeRequiresLayout):
* rendering/style/RenderStyleConstants.h:
* rendering/style/StyleRareInheritedData.h:

LayoutTests:
* fast/css3-text/css3-text-justify/getComputedStyle/script-tests/getComputedStyle-text-justify-inherited.js:
* fast/css3-text/css3-text-justify/getComputedStyle/script-tests/getComputedStyle-text-justify.js:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@171677 268f45cc-cd09-0410-ab3c-d52691b4dbfc