Make ChangeLogEntry detect annotations by prepare-ChangeLog (Added/Removed/Copied from/Renamed from) as clean.
https://bugs.webkit.org/show_bug.cgi?id=108433

Patch by Timothy Loh <timloh@chromium.com> on 2013-02-03
Reviewed by Eric Seidel.

PrepareChangeLog is supposed to update the file/function list if we
haven't touched it, but the existing regex doesn't handle the
annotations prepare-ChangeLog adds (e.g. "Added.")

* Scripts/webkitpy/common/checkout/changelog.py:
(ChangeLogEntry.is_touched_files_text_clean):
* Scripts/webkitpy/common/checkout/changelog_unittest.py:
(test_is_touched_files_text_clean):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141723 268f45cc-cd09-0410-ab3c-d52691b4dbfc