https://bugs.webkit.org/show_bug.cgi?id=127139

Reviewed by Brady Eidson.

Source/WebCore: 

* platform/ios/WebCoreSystemInterfaceIOS.mm:
* platform/mac/WebCoreSystemInterface.h:
* platform/mac/WebCoreSystemInterface.mm:
Pass first party URL down, because reading cookies depends on it when this policy
in in action.

* platform/network/cf/CookieJarCFNet.cpp:
(WebCore::copyCookiesForURLWithFirstPartyURL):
(WebCore::cookiesForDOM):
(WebCore::cookieRequestHeaderFieldValue):
(WebCore::cookiesEnabled):
(WebCore::getRawCookies):
Use a new CFNetwork API that takes first party URL.

* platform/network/mac/CookieJarMac.mm:
(WebCore::cookiesForDOM):
(WebCore::cookieRequestHeaderFieldValue):
(WebCore::cookiesEnabled):
(WebCore::getRawCookies):
(WebCore::deleteCookie):
Pass first party URL (and null in deleteCookie, as there is none).

* platform/network/mac/ResourceHandleMac.mm:
(WebCore::ResourceHandle::platformLoadResourceSy...