By default, filters out 'ChangeLog'. A pain directly coming from Webkit.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/543012

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@36008 0039d316-1c4b-4281-b951-d872f2087c98