License check: remove the special case for protobuf2, README.chromium is now in place.
License check: remove the special case for protobuf2,
README.chromium is now in place.

TBR=evan

BUG=28291
TEST=tools/licenses.py scan
Review URL: http://codereview.chromium.org/3418006

git-svn-id: http://src.chromium.org/svn/trunk/src@59431 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: ff40513c4cb9c3d2626ebe8dd4c2a5962e110689
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser