gn format: fix some cases of too many blank lines between items

R=brettw@chromium.org
BUG=348474

Review URL: https://codereview.chromium.org/636663002

Cr-Original-Commit-Position: refs/heads/master@{#298341}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 785ffa786a39e0b98ff3ebf1dfeec3c47340fd15
6 files changed
tree: 0fef5db0655451a812c4f28bd4c3fd194d020c39
  1. tools/