Reviewed by Brady Eidson.

    Reviewed by Brady Eidson.

        https://bugs.webkit.org/show_bug.cgi?id=31844
        SocketStreamHandleCFNet should support CONNECT proxy credentials

        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * platform/network/CredentialStorage.h:
        * platform/network/mac/CredentialStorageMac.mm: Added.
        (WebCore::CredentialStorage::getFromPersistentStorage):
        * platform/network/cf/CredentialStorageCFNet.cpp: Added.
        (WebCore::CredentialStorage::getFromPersistentStorage):
        Add support for fetching credentials from persistent storage (CFNet version is currently
        a stub).

        * bindings/js/JSWebSocketCustom.cpp: Removed an unneeded include.

        * platform/network/cf/SocketStreamHandle.h:
        * platform/network/cf/SocketStreamHandleCFNet.cpp:
        (WebCore::SocketStreamHandle::SocketStreamHandle):
        (WebCore::SocketStreamHandle::createStreams):
        (WebCore::getStoredCONNECTProxyCredentials):
        (WebCore::authenticationSchemeFromAuthenticationMethod):
        (WebCore::SocketStreamHandle::addCONNECTCredentials):
        (WebCore::SocketStreamHandle::readStreamCallback):
        Check if connection attempt was resulted in 407, and try stored credentials if it did.

        * platform/mac/WebCoreSystemInterface.h:
        * platform/mac/WebCoreSystemInterface.mm:
        * WebCore.base.exp:
        Updated WKSI.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@51354 268f45cc-cd09-0410-ab3c-d52691b4dbfc