Update the GN style guide on target naming.

This makes it clear that executable names should be unique.

TBR=dpranke

Review URL: https://codereview.chromium.org/1208053007

Cr-Original-Commit-Position: refs/heads/master@{#337635}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b4729ae5177c9b4fe72c6fe9f147990829d6bbef
1 file changed
tree: 6b9d4ef7b9512f4e9077d9fd4f5626b22253faa1
  1. tools/