Addressing more post-review comments in r177035

* accessibility/AccessibilitySlider.cpp:
(WebCore::AccessibilitySliderThumb::elementRect):
* html/HTMLInputElement.cpp:
(WebCore::HTMLInputElement::setupDateTimeChooserParameters):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@177444 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Make Ref::copyRef const and ref-qualified
https://bugs.webkit.org/show_bug.cgi?id=139730

Reviewed by Andreas Kling.

* wtf/Ref.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@177445 268f45cc-cd09-0410-ab3c-d52691b4dbfc