Merge 97745 - REGRESSION(r97248): :visited as descendant selector broken

Merge 97745 - REGRESSION(r97248): :visited as descendant selector broken
https://bugs.webkit.org/show_bug.cgi?id=70122

Source/WebCore: 

Reviewed by Nikolas Zimmerman.
        
Make ":visited foo" and similar selectors work correctly again. They can affect 
the visited style of an element inside a visited link.

Test: fast/selectors/visited-descendant.html

* css/CSSStyleSelector.cpp:
(WebCore::CSSStyleSelector::applyDeclarations): 
        
    Apply visited style to children of visited links too.
            
* css/SelectorChecker.cpp:
(WebCore::SelectorChecker::checkSelector): 
        
    Don't disable visited matching until we run into first ancestor link or use combinator other than child/descendant.

(WebCore::SelectorChecker::determineLinkMatchType):
        
    Look into child/descendant component selectors too to determine the link match type.

LayoutTests: 

Reviewed by Nikolas Zimmerman.

* fast/selectors/visited-descendant.html: Added.
* platform/mac/fast/selectors/visited-descendant-expected.txt: Added.



TBR=tkent@chromium.org
BUG=crbug.com/101023
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=98067