Add browser test for restrictOwnAudio, and switches for autosharing
screen with audio.

Add browser tests for restrictOwnAudio that checks if the correct
audio deviceId is created with the possible values for
restrictOwnAudio and suppressLocalAudioPlayback.

This test needs a screen to be auto picked. A new chrome switch
(kAutoSelectScreenCaptureSource) is added to accomplish that. There
is and old kAutoSelectDesktopCaptureSource that can autoselect
screens based on name. But the screens have different names on
different platforms, and can be different on the same platform if
you have one or several screens. So the old switch is hard to use.
This new kAutoSelectScreenCaptureSource autoselects any screen, so
you loose control, but you don't need to know the name of the
screen.

The test also need that system audio is shared. So a
kSystemAudioCaptureDefaultChecked is added to change so system 
audio is shared by default when sharing a screen or window.

The kScreenCaptureAudioDefaultUnchecked is renamed to
kTabCaptureAudioDefaultUnchecked). From the ScreenCapture prefix it
was hard to understand it only effected the share audio toggle on
the share tab selection, so it is renamed to have a TabCapture
prefix.

Bug: 415952276
Change-Id: I8caf07ebf483f96a881694358b38cf33947f04b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6611139
Reviewed-by: Tove Petersson <tovep@chromium.org>
Reviewed-by: Tomas Gunnarsson <tommi@chromium.org>
Commit-Queue: Olov Brändström <brandstrom@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1478558}