Use erase-remove idiom for dead-declaration removal.

Change-Id: I4ba2aed45c461ae77017d0d60307dcf2859989a9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/314461
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
1 file changed