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        Reviewed by Shinichiro Hamaji.

        Moved filter-related check-webkit-style code into a separate
        filter module.

        https://bugs.webkit.org/show_bug.cgi?id=34408

        This is preparatory refactoring for Bug 33684, which will allow
        file and folder-specific filter rules.

        * Scripts/webkitpy/style/checker.py:
          - Removed CategoryFilter class (moved to filter.py).

        * Scripts/webkitpy/style/checker_unittest.py:
          - Removed CategoryFilter unit tests (moved to filter_unittest.py).

        * Scripts/webkitpy/style/filter.py: Added.
          - Added CategoryFilter class (moved from checker.py).

        * Scripts/webkitpy/style/filter_unittest.py: Added.
          - Added CategoryFilter unit tests (moved from checker_unittest.py).

        * Scripts/webkitpy/style/unittests.py:
          - Added reference to filter_unittest.py.

git-svn-id: svn://svn.chromium.org/blink/trunk@54234 bbb929c8-8fbe-4397-9dbb-9b2b20218538