76 columns is fine for most patches but reverts will eat another
4 spaces in indentation. For the sake of revert clarity this reference
line is reduced to 72 columns.

Review URL: https://chromiumcodereview.appspot.com/16152005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@203530 0039d316-1c4b-4281-b951-d872f2087c98