Clean-up: Fixes the wrong indentation in bounded_label.cc.

Let me TBR because the fix is very trivial.

TBR=stevenjb@chromium.org
TEST=none

Review URL: https://codereview.chromium.org/116863005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242520 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242520