Remove WKBundlePageGetHeaderLayer/Footer SPI
https://bugs.webkit.org/show_bug.cgi?id=116254

Reviewed by Benjamin Poulain.

We should remove the Remove WKBundlePageGetHeaderLayer/Footer SPI. It was only 
recently added and have been replaced by WKBundlePageSetHeaderBanner/Footer.

* WebKit2.xcodeproj/project.pbxproj:
* WebProcess/InjectedBundle/API/c/mac/WKBundlePagePrivateMac.h: Removed.
* WebProcess/InjectedBundle/API/c/mac/WKBundlePagePrivateMac.mm: Removed.
* WebProcess/WebPage/WebPage.h:
(WebPage):
* WebProcess/WebPage/mac/WebPageMac.mm:
(WebKit):
(WebKit::WebPage::updateHeaderAndFooterLayersForDeviceScaleChange):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150243 268f45cc-cd09-0410-ab3c-d52691b4dbfc