Function parameter quotePair can be passed by reference
https://bugs.webkit.org/show_bug.cgi?id=115089

Reviewed by Alexey Proskuryakov.

Minor performance patch.

* rendering/style/QuotesData.cpp:
(WebCore::QuotesData::addPair):
* rendering/style/QuotesData.h:
(QuotesData):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149080 268f45cc-cd09-0410-ab3c-d52691b4dbfc