Move code for finding rendered character offset to RenderTextLineBoxes
https://bugs.webkit.org/show_bug.cgi?id=122892

Reviewed by Andreas Kling.

* rendering/RenderText.cpp:
(WebCore::RenderText::countRenderedCharacterOffsets):
(WebCore::RenderText::containsRenderedCharacterOffset):
        
    Renamed for consistency.

* rendering/RenderTextLineBoxes.cpp:
(WebCore::RenderTextLineBoxes::countCharacterOffsets):
        
    This used to be Position::renderedPosition.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157517 268f45cc-cd09-0410-ab3c-d52691b4dbfc