Fix gn get_label_info comment Review-Url: https://codereview.chromium.org/2929893002 Cr-Original-Commit-Position: refs/heads/master@{#478042} Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src Cr-Mirrored-Commit: f8bf5083fb27aa1b7c5786854f62da9b5b5532f3