Remove unused proto imports. am: b1f0ad8bae

Original change: https://android-review.googlesource.com/c/platform/frameworks/proto_logging/+/3530633

Change-Id: I78224106cc507b8180ba2f454cbb7244bf47e0d8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: eea5a65a4c9298638f62bb154cb293fd1dec0426
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