AudioManagerAndroid: remove audio focus request and saved audio mode

AudioManagerAndroid: remove audio focus request and saved audio mode

We used to request audio focus in AndioManagerAndroid and save/restore
the audio mode. Both are not necessary now.

The newly added MediaSessionDelegate will take care of audio focus.
And it's more resonable to switch back to NORMAL since we can't know
that the saved mode is still valid. This will be handled by Android
audio frame.

BUG=650533
Committed: https://crrev.com/03623e2394747cac121f6c7d4dc011e0418e2b64
Cr-Commit-Position: refs/heads/master@{#426519}

[braveyao, 2016-10-20 01:01:18]

The CQ bit was checked by braveyao@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-20 01:02:40]

Dry run: 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, 2016-10-20 02:52:56]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-10-20 02:52:57]

Dry run: This issue passed the CQ dry run.

[braveyao, 2016-10-20 17:01:39]

braveyao@chromium.org changed reviewers:
+ qinmin@chromium.org

[braveyao, 2016-10-20 17:01:40]

Hi qinmin,

Please take a look at this!

[qinmin, 2016-10-20 17:03:28]

lgtm

[braveyao, 2016-10-20 17:04:23]

The CQ bit was checked by braveyao@chromium.org

[commit-bot: I haz the power, 2016-10-20 17:04:46]

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, 2016-10-20 17:23:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-21 13:19:46]

Description was changed from

==========
AudioManagerAndroid: remove audio focus request and saved audio mode

We used to request audio focus in AndioManagerAndroid and save/restore
the audio mode. Both are not necessary now.

The newly added MediaSessionDelegate will take care of audio focus.
And it's more resonable to switch back to NORMAL since we can't know
that the saved mode is still valid. This will be handled by Android
audio frame.

BUG=650533
==========

to

==========
AudioManagerAndroid: remove audio focus request and saved audio mode

We used to request audio focus in AndioManagerAndroid and save/restore
the audio mode. Both are not necessary now.

The newly added MediaSessionDelegate will take care of audio focus.
And it's more resonable to switch back to NORMAL since we can't know
that the saved mode is still valid. This will be handled by Android
audio frame.

BUG=650533

Committed: https://crrev.com/03623e2394747cac121f6c7d4dc011e0418e2b64
Cr-Commit-Position: refs/heads/master@{#426519}
==========

[commit-bot: I haz the power, 2016-10-21 13:19:47]

Patchset 1 (id:??) landed as
https://crrev.com/03623e2394747cac121f6c7d4dc011e0418e2b64
Cr-Commit-Position: refs/heads/master@{#426519}