Change all relative imports in webkitpy to absolute imports.

third_party/WebKit/Tools/Scripts/webkitpy/style/optparser.py

 # Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 # 1.  Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
 # 2.  Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in the
 #     documentation and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 # DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 # DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 # ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 """Supports the parsing of command-line options for check-webkit-style."""
 
 import logging
 from optparse import OptionParser
 import sys
 
-from filter import validate_filter_rules
+from webkitpy.style.filter import validate_filter_rules
 # This module should not import anything from checker.py.
 
 _log = logging.getLogger(__name__)
 
 _USAGE = """usage: %prog [--help] [options] [path1] [path2] ...
 
 Overview:
   Check coding style according to WebKit style guidelines:
 
       http://webkit.org/coding/coding-style.html
@@ skipping 400 matching lines @@
             self._parse_error(err)
 
         options = CommandOptionValues(filter_rules=filter_rules,
                                       git_commit=git_commit,
                                       diff_files=diff_files,
                                       is_verbose=is_verbose,
                                       min_confidence=min_confidence,
                                       output_format=output_format)
 
         return (paths, options)