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Input stream needs to release itself from AudioManager by calling
ReleaseInputStream after closing, but CastAudioInputStream didn't, and
thus will not be able to create new streams after open/close 16 times.

Bug: internal: 144114606
Test: Compile.
Change-Id: Ic2ee3e8e5110bee3597380620f06e48731786199
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954450Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Kehuang Li <kehuangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722563}