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This reverts commit d6d50478.

Reason for revert: This CL is very likely to cause the build failure for https://ci.chromium.org/p/chromium/builders/ci/Cast%20Audio%20Linux/68631.

Original change's description:
> Feed refactor: Proto conversion
> 
> Add StreamModelUpdateRequest and functions for converting wire protos into store protos
> 
> Bug: 1044139
> Change-Id: I243ebabc331884500dec480c69d843d38546a34e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020545
> Commit-Queue: Ian Wells <iwells@chromium.org>
> Reviewed-by: Dan H <harringtond@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#747983}

TBR=iwells@chromium.org,harringtond@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1044139
Change-Id: Ide56a6466080cd643c9cf27632d158d8323fef07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094476Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748080}