Reviewed by Xan Lopez.

        [Soup] Random crashes in http/tests/websocket/tests/workers/worker-handshake-challenge-randomness.html
        https://bugs.webkit.org/show_bug.cgi?id=48805

        Track active WebSocket handles via a sequential id. This ensures
        that when a handle is reallocated into a recently used segment of
        memory, it doesn't trigger a false positive in the code which ensures
        the original handle is active.

        No new tests. This test should stop crashing on the bots, proving the fix.

        * platform/network/soup/SocketStreamHandle.h:
        (WebCore::SocketStreamHandle::id): Added an m_id member and accessor
        to SocketStreamHandle.
        * platform/network/soup/SocketStreamHandleSoup.cpp:
        (WebCore::getHandleFromId): Updated to work with HashMap of handle ids to
        SocketStreamHandle*.
        (WebCore::deactivateHandle): Ditto.
        (WebCore::activateHandle): Ditto.
        (WebCore::SocketStreamHandle::SocketStreamHandle): Ditto.
        (WebCore::SocketStreamHandle::connected): Ditto.
        (WebCore::SocketStreamHandle::readBytes): Ditto.
        (WebCore::SocketStreamHandle::beginWaitingForSocketWritability): Ditto.
        (WebCore::connectedCallback): Ditto.
        (WebCore::readReadyCallback): Ditto.
        (WebCore::writeReadyCallback): Ditto.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@71080 268f45cc-cd09-0410-ab3c-d52691b4dbfc