Use the Cookie Storage from the Private Browsing Storage Session directly

Use the Cookie Storage from the Private Browsing Storage Session directly
https://bugs.webkit.org/show_bug.cgi?id=55986

Reviewed by Adam Roben.

Source/WebCore:

* WebCore.exp.in:
* platform/mac/WebCoreSystemInterface.h:
* platform/mac/WebCoreSystemInterface.mm:

* platform/network/mac/CookieStorageMac.mm:
(WebCore::setCookieStoragePrivateBrowsingEnabled):
Just copy the cookie storage from the private browsing storage session.
* platform/network/cf/CookieStorageCFNet.cpp:
(WebCore::setCookieStoragePrivateBrowsingEnabled):
Ditto.

Source/WebKit/mac:

* WebCoreSupport/WebSystemInterface.mm:
(InitWebCoreSystemInterface):

Source/WebKit2:

* WebProcess/WebCoreSupport/mac/WebSystemInterface.mm:
(InitWebCoreSystemInterface):

WebKitLibraries:

* WebKitSystemInterface.h:
* libWebKitSystemInterfaceLeopard.a:
* libWebKitSystemInterfaceSnowLeopard.a:
* win/include/WebKitSystemInterface/WebKitSystemInterface.h:
* win/lib/WebKitSystemInterface.lib:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@80643 268f45cc-cd09-0410-ab3c-d52691b4dbfc