Revert "Register Dumpables for Region Sampler"

Revert submission 20697806-register dumpables for Region Sampler

Reason for revert: Breaking test b/266840181

Reverted changes: /q/submissionid:20697806-register+dumpables+for+Region+Sampler

Change-Id: I67f071cd262ddeba86ea01842016fb4a5b8c62ea
5 files changed