Remove support for manual memory management in GrVkMemory.

These code paths are no longer used now that the GrBackendTexture code
uses the normal Ganesh code paths.

Change-Id: Idecf6876d96c7be587919f969d4736374d82c199
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/289623
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed