I have a large rename change and it's impossible to upload because the size of the CC field is above the maximum 2000 characters in Reitveld.

Review URL: https://chromiumcodereview.appspot.com/16366008

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@205323 0039d316-1c4b-4281-b951-d872f2087c98