Make it more consistent across the tool. Using \s also includes \n, which
confuses the tool.

Add more tests.

R=iannucci@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/14265007

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@195214 0039d316-1c4b-4281-b951-d872f2087c98