Reviewed by Tony Chang.

        Change more modules in the layout-tests code to use the
        filesystem wrapper for cleaner unit testing.

        This patch also adds the glob() wrapper to the filesystem
        abstraction.

        https://bugs.webkit.org/show_bug.cgi?id=52604

        * Scripts/webkitpy/layout_tests/port/test_files.py:
        * Scripts/webkitpy/layout_tests/port/test_files_unittest.py:
        * Scripts/webkitpy/layout_tests/test_types/test_type_base.py:
        * Scripts/webkitpy/layout_tests/layout_package/dump_render_tree_thread.py:
        * Scripts/webkitpy/common/system/filesystem.py:
        * Scripts/webkitpy/common/system/filesystem_mock.py:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@76150 268f45cc-cd09-0410-ab3c-d52691b4dbfc