Remove extra newlines added to auto-importer CL descriptions.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/deps_updater.py

 # Copyright 2014 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.
 
 """Fetches a copy of the latest state of a W3C test repository and commits.
 
 If this script is given the argument --auto-update, it will also:
  1. Upload a CL.
  2. Trigger try jobs and wait for them to complete.
  3. Make any changes that are required for new failing tests.
@@ skipping 324 matching lines @@
         ] + ['--cc=' + email for email in cc_list])
 
     def _cl_description(self):
         description = self.check_run(['git', 'log', '-1', '--format=%B'])
         build_link = self._build_link()
         if build_link:
             description += 'Build: %s\n\n' % build_link
         description += 'TBR=qyearsley@chromium.org\n'
         # Move any NOEXPORT tag to the end of the description.
         description = description.replace('NOEXPORT=true', '')
+        description = description.replace('\n\n\n\n', '\n\n')
         description += 'NOEXPORT=true'
         return description
 
     def _build_link(self):
         """Returns a link to a job, if running on buildbot."""
         master_name = self.host.environ.get('BUILDBOT_MASTERNAME')
         builder_name = self.host.environ.get('BUILDBOT_BUILDERNAME')
         build_number = self.host.environ.get('BUILDBOT_BUILDNUMBER')
         if not (master_name and builder_name and build_number):
             return None
@@ skipping 95 matching lines @@
         """Returns a dict mapping source to dest name for layout tests that have been renamed."""
         out = self.check_run(['git', 'diff', 'origin/master', '-M100%', '--diff-filter=R', '--name-status'])
         renamed_tests = {}
         for line in out.splitlines():
             _, source_path, dest_path = line.split()
             source_test = self.finder.layout_test_name(source_path)
             dest_test = self.finder.layout_test_name(dest_path)
             if source_test and dest_test:
                 renamed_tests[source_test] = dest_test
         return renamed_tests