Use width instead of weight for width on mac.

Copy pasta caused the requested weight to be used instead of the
requested width when calculating the correct width value to request from
CoreText.

Change-Id: I1dbc093fe9c6173f7d940ced5772c092a911d9bb
Reviewed-on: https://skia-review.googlesource.com/c/172961
Commit-Queue: Herb Derby <herb@google.com>
Auto-Submit: Ben Wagner <bungeman@google.com>
Reviewed-by: Herb Derby <herb@google.com>
1 file changed