Revert of Initialize default audio device ID with explicit device ID.

Revert of Initialize default audio device ID with explicit device ID. (patchset #2 id:20001 of https://codereview.chromium.org/2812903002/ )

Reason for revert:
Patchset 2 restores the behavior I wanted to eliminate. 

Original issue's description:
> Initialize default audio device ID with explicit device ID.
> 
> This is more consistent with how video device IDs are specified and is
> also a small first step towards implementing the standard constraints
> algorithm for audio. 
> This CL disables a misleading selector that allows switching the 
> user-preferred device in the middle of a getUserMedia call.
> Since that selector does not affect the current getUserMedia call, it
> is better to have it disabled, which is already the case with video
> devices.
> 
> BUG=708081
> 
> Review-Url: https://codereview.chromium.org/2812903002
> Cr-Commit-Position: refs/heads/master@{#463624}
> Committed: https://chromium.googlesource.com/chromium/src/+/82382cca8c9aa804acb7fd9cfaa6e4478f92cd7d

TBR=hbos@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=708081
Review-Url: https://codereview.chromium.org/2813543005
Cr-Commit-Position: refs/heads/master@{#463634}
Committed: https://chromium.googlesource.com/chromium/src/+/cf8ea8d590f1c89c2633c793a41bd31a85b3fe72

[Guido Urdaneta, 2017-04-11 15:07:34]

The CQ bit was checked by guidou@chromium.org

[Guido Urdaneta, 2017-04-11 15:07:35]

Created Revert of Initialize default audio device ID with explicit device ID.

[commit-bot: I haz the power, 2017-04-11 15:08:05]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-11 15:08:49]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1491923254909530, "parent_rev":
"8053f4425ca43ee13368cdfb54ff1d73d935bd9d", "commit_rev":
"cf8ea8d590f1c89c2633c793a41bd31a85b3fe72"}

[commit-bot: I haz the power, 2017-04-11 15:09:41]

Description was changed from

==========
Revert of Initialize default audio device ID with explicit device ID. (patchset
#2 id:20001 of https://codereview.chromium.org/2812903002/ )

Reason for revert:
Patchset 2 restores the behavior I wanted to eliminate. 

Original issue's description:
> Initialize default audio device ID with explicit device ID.
> 
> This is more consistent with how video device IDs are specified and is
> also a small first step towards implementing the standard constraints
> algorithm for audio. 
> This CL disables a misleading selector that allows switching the 
> user-preferred device in the middle of a getUserMedia call.
> Since that selector does not affect the current getUserMedia call, it
> is better to have it disabled, which is already the case with video
> devices.
> 
> BUG=708081
> 
> Review-Url: https://codereview.chromium.org/2812903002
> Cr-Commit-Position: refs/heads/master@{#463624}
> Committed:
https://chromium.googlesource.com/chromium/src/+/82382cca8c9aa804acb7fd9cfaa6...

TBR=hbos@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=708081
==========

to

==========
Revert of Initialize default audio device ID with explicit device ID. (patchset
#2 id:20001 of https://codereview.chromium.org/2812903002/ )

Reason for revert:
Patchset 2 restores the behavior I wanted to eliminate. 

Original issue's description:
> Initialize default audio device ID with explicit device ID.
> 
> This is more consistent with how video device IDs are specified and is
> also a small first step towards implementing the standard constraints
> algorithm for audio. 
> This CL disables a misleading selector that allows switching the 
> user-preferred device in the middle of a getUserMedia call.
> Since that selector does not affect the current getUserMedia call, it
> is better to have it disabled, which is already the case with video
> devices.
> 
> BUG=708081
> 
> Review-Url: https://codereview.chromium.org/2812903002
> Cr-Commit-Position: refs/heads/master@{#463624}
> Committed:
https://chromium.googlesource.com/chromium/src/+/82382cca8c9aa804acb7fd9cfaa6...

TBR=hbos@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=708081

Review-Url: https://codereview.chromium.org/2813543005
Cr-Commit-Position: refs/heads/master@{#463634}
Committed:
https://chromium.googlesource.com/chromium/src/+/cf8ea8d590f1c89c2633c793a41b...
==========

[commit-bot: I haz the power, 2017-04-11 15:09:42]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/cf8ea8d590f1c89c2633c793a41b...

[Guido Urdaneta, 2017-04-11 15:53:16]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2809043004/ by guidou@chromium.org.

The reason for reverting is: Will attempt to reland by reverting changes in MSM
and updating extensions test..