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        Reviewed by Shinichiro Hamaji.

        In check-webkit-style, eliminated the dependency of
        processors/cpp_unittest.py on checker.py.

        https://bugs.webkit.org/show_bug.cgi?id=34205

        * Scripts/webkitpy/style/checker.py:
          - Addressed FIXME by removing STYLE_CATEGORIES data.
          - Added style_categories().

        * Scripts/webkitpy/style/checker_unittest.py:
          - Minor changes.

        * Scripts/webkitpy/style/processors/cpp.py:
          - Added categories attribute to CppProcessor class (data
            was originally checker.STYLE_CATEGORIES).

        * Scripts/webkitpy/style/processors/cpp_unittest.py:
          - Addressed FIXME by eliminating "import" from checker.py.

git-svn-id: svn://svn.chromium.org/blink/trunk@53990 bbb929c8-8fbe-4397-9dbb-9b2b20218538