New copyright boilerplate policy for presubmit: don't require the current year on all modified files, and don't require (c).
New copyright boilerplate policy for presubmit: don't require the current year
on all modified files, and don't require (c).

BUG=140977
Review URL: https://chromiumcodereview.appspot.com/10824191

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@150417 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools