Apparently, line metrics should not include newlines

(Flutter doc is wrong)
Bug: skia:12127

Change-Id: I422a870d3cf6346cf8b37834fe89c846f804e236
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/423586
Commit-Queue: Julia Lavrova <jlavrova@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
8 files changed