Reviewed by Ojan Vafai.

        Remove rietveld code now that it's unused
        https://bugs.webkit.org/show_bug.cgi?id=48359

        Was cool that we added this support, but now that it's
        not used it makes little sense to keep it around.
        We can always restore this code from SVN if we need it.

        * Scripts/webkitpy/common/config/__init__.py:
        * Scripts/webkitpy/common/net/bugzilla.py:
        * Scripts/webkitpy/common/net/bugzilla_unittest.py:
        * Scripts/webkitpy/common/net/rietveld.py: Removed.
        * Scripts/webkitpy/common/net/rietveld_unittest.py: Removed.
        * Scripts/webkitpy/thirdparty/__init__.py:
        * Scripts/webkitpy/tool/commands/download.py:
        * Scripts/webkitpy/tool/commands/download_unittest.py:
        * Scripts/webkitpy/tool/commands/queues.py:
        * Scripts/webkitpy/tool/commands/queues_unittest.py:
        * Scripts/webkitpy/tool/main.py:
        * Scripts/webkitpy/tool/mocktool.py:
        * Scripts/webkitpy/tool/steps/__init__.py:
        * Scripts/webkitpy/tool/steps/postcodereview.py: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@70570 268f45cc-cd09-0410-ab3c-d52691b4dbfc