Switch to using withContext in ScreenshotSoundController

Avoid passing Deferred objects between the SoundController and
ScreenshotController, especially since we're not using the return value
anyway.

Bug: 326441239
Bug: 329659738
Fix: 326441239
Test: atest ScreenshotSoundControllerTest
Flag: NONE
Change-Id: I7d8e2e85f10eaaa75800b8e37a0269b4e63b8ca7
Merged-In: I7d8e2e85f10eaaa75800b8e37a0269b4e63b8ca7
3 files changed