[build] Activate assert to check GN SDK version is equal to manifest

Bug: 891996
Change-Id: I5904066ca893c536cbed87b3e6fa55b1210f5f65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1675323
Auto-Submit: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672090}
1 file changed