gclient: implement a less hacky relative URL implementation

gclient_scm.py

 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Gclient-specific SCM-specific operations."""
 
 import logging
 import os
 import re
 import subprocess
@@ skipping 39 matching lines @@
     self.url = url
     self._root_dir = root_dir
     if self._root_dir:
       self._root_dir = self._root_dir.replace('/', os.sep)
     self.relpath = relpath
     if self.relpath:
       self.relpath = self.relpath.replace('/', os.sep)
     if self.relpath and self._root_dir:
       self.checkout_path = os.path.join(self._root_dir, self.relpath)
 
-  def FullUrlForRelativeUrl(self, url):
-    # Find the forth '/' and strip from there. A bit hackish.
-    return '/'.join(self.url.split('/')[:4]) + url
-
   def RunCommand(self, command, options, args, file_list=None):
     # file_list will have all files that are modified appended to it.
     if file_list is None:
       file_list = []
 
     commands = ['cleanup', 'export', 'update', 'revert', 'revinfo',
                 'status', 'diff', 'pack', 'runhooks']
 
     if not command in commands:
       raise gclient_utils.Error('Unknown command %s' % command)
@@ skipping 433 matching lines @@
           self.ReplaceAndPrint(line)
         else:
           if (line.startswith(self.original_prefix) or
               line.startswith(self.working_prefix)):
             self.ReplaceAndPrint(line)
           else:
             print line
 
     filterer = DiffFilterer(self.relpath)
     self.RunAndFilterOutput(command, path, False, False, filterer.Filter)