GitLab

Currently log lines from the plugin get 2 newlines, which wastes space in
the console output. This strips off the extra newline.

Review URL: https://codereview.chromium.org/308183004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274312 0039d316-1c4b-4281-b951-d872f2087c98