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This reverts commit df6e77ca.

Reason for revert: Reverting as suspect of failing case_media_unittests . https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Cast%20Audio%20Linux/16824 :

[ RUN      ] CastAudioManagerTest.MakeAudioOutputStreamProxy
../../chromecast/media/audio/cast_audio_manager_unittest.cc:106: Failure
Actual function call count doesn't match EXPECT_CALL(*backend, Initialize())...
         Expected: to be called once
           Actual: never called - unsatisfied and active
Stack trace:
#0 0x00000054cffc testing::internal::UnitTestImpl::CurrentOsStackTraceExceptTop()
#1 0x00000054c9d9 testing::internal::AssertHelper::operator=()
#2 0x00000053ddd3 testing::internal::GoogleTestFailureReporter::ReportFailure()
#3 0x0000005405b6 testing::internal::UntypedFunctionMockerBase::VerifyAndClearExpectationsLocked()
#4 0x0000003e7142 chromecast::media::MockCmaBackend::~MockCmaBackend()
#5 0x0000003a7340 testing::StrictMock<>::~StrictMock()
#6 0x0000003a44b5 chromecast::media::(anonymous namespace)::CastAudioManagerTest_MakeAudioOutputStreamProxy_Test::TestBody()
../../chromecast/media/audio/cast_audio_manager_unittest.cc:105: Failure
Actual function call count doesn't match EXPECT_CALL(*backend, CreateAudioDecoder())...
         Expected: to be called once
           Actual: never called - unsatisfied and active

Original change's description:
> Fetch and apply Multiroom info in CAOS
> 
> CastAudioOutputStream can now use internal backends with multizone. In
> order for multizone to work, we first need to retrieve the multiroom
> info and pass it to the backend.
> 
> BUG=b:111694183
> TEST=Build, cast_media_unittests
> 
> Change-Id: I128a6b0cc1a389d01102007244fdb5594dd4c637
> Reviewed-on: https://chromium-review.googlesource.com/1145892
> Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
> Reviewed-by: Luke Halliwell <halliwell@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Aidan Wolter <awolter@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#578670}

TBR=sky@chromium.org,gab@chromium.org,halliwell@chromium.org,jameswest@chromium.org,kmackay@chromium.org,awolter@chromium.org

Change-Id: I519349d1cd87709c2a1bd39299420b5a7df7bcee
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b:111694183
Reviewed-on: https://chromium-review.googlesource.com/1153309Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578685}