[WK2][CoordinatedGraphics] Avoid dispensable calls to WebView::updateViewportSize()
https://bugs.webkit.org/show_bug.cgi?id=116045

Patch by Jesus Sanchez-Palencia <jesus.palencia@openbossa.org> on 2013-05-13
Reviewed by Darin Adler.

* UIProcess/CoordinatedGraphics/WebView.cpp:
(WebKit::WebView::setSize):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150024 268f45cc-cd09-0410-ab3c-d52691b4dbfc