[svg] Minor cleanup

Replace a bunch of no-op stubs with a default template impl.

Change-Id: I37b24361dcf3d7c247a12a7c20a9f3a967b6f9e6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/354877
Commit-Queue: Florin Malita <fmalita@chromium.org>
Commit-Queue: Tyler Denniston <tdenniston@google.com>
Auto-Submit: Florin Malita <fmalita@chromium.org>
Reviewed-by: Tyler Denniston <tdenniston@google.com>
1 file changed