Reviewed by Mitz.

    Reviewed by Mitz.

        - fix crash visible on buildbot and also when running the test
          anchor-image-scrolled-x-y.html under libgmalloc

        * loader/mac/WebSubresourceLoader.h: Renamed m_loader to m_handle
        now that the class is named ResourceHandle.
        * loader/mac/WebSubresourceLoader.mm: Renaming, plus:
        (WebCore::SubresourceLoader::didFinishLoading): Get the handle into
        a local RefPtr before calling finishJobAndHandle, since we might get
        cancelled inside that function, so we should not rely on m_handle to
        keep the ResourceHandle alive.
        (WebCore::SubresourceLoader::didFail): Ditto.
        (WebCore::SubresourceLoader::didCancel): Ditto.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@17414 268f45cc-cd09-0410-ab3c-d52691b4dbfc