Merge M50: "Drop media session on playback error; avoids idle suspension."

Merge M50: "Drop media session on playback error; avoids idle suspension."

Avoids leaving a stale interactive session when the player is in
the error state and also avoids idle suspension from running later
and triggering an invalid state error.

The pipeline has already released its resources internally when the
error occurred so the idle suspension is not necessary.

BUG=596157
Review URL: https://codereview.chromium.org/1815293003

Cr-Commit-Position: refs/heads/master@{#382137}
(cherry picked from commit 60030663a474eb523aa9c958e5fe88fa844d8b79)

Committed: https://chromium.googlesource.com/chromium/src/+/0a7d7379015541ad6356f2cb4d90be4614ca3135

[DaleCurtis, 2016-03-21 17:57:42]

Description was changed from

==========
Merge M50: "Drop media session on playback error; avoids idle suspension."

Avoids leaving a stale interactive session when the player is in
the error state and also avoids idle suspension from running later
and triggering an invalid state error.

The pipeline has already released its resources internally when the
error occurred so the idle suspension is not necessary.

BUG=596157

Review URL: https://codereview.chromium.org/1815293003

Cr-Commit-Position: refs/heads/master@{#382137}
(cherry picked from commit 60030663a474eb523aa9c958e5fe88fa844d8b79)
==========

to

==========
Merge M50: "Drop media session on playback error; avoids idle suspension."

Avoids leaving a stale interactive session when the player is in
the error state and also avoids idle suspension from running later
and triggering an invalid state error.

The pipeline has already released its resources internally when the
error occurred so the idle suspension is not necessary.

BUG=596157

Review URL: https://codereview.chromium.org/1815293003

Cr-Commit-Position: refs/heads/master@{#382137}
(cherry picked from commit 60030663a474eb523aa9c958e5fe88fa844d8b79)

Committed:
https://chromium.googlesource.com/chromium/src/+/0a7d7379015541ad6356f2cb4d90...
==========

[DaleCurtis, 2016-03-21 17:57:44]

Committed patchset #1 (id:1) manually as
0a7d7379015541ad6356f2cb4d90be4614ca3135.