MediaRecorder: add mime type to recorded blobs

MediaRecorder: add mime type to recorded blobs

... which was forgotten.

This CL also extends appropriately the LayoutTest (and does a micro fix).

BUG=615940
Committed: https://crrev.com/3e7d8241bc996051f1617b08656b2687cff0a1a0
Cr-Commit-Position: refs/heads/master@{#409397}

[mcasas, 2016-08-02 20:40:10]

Patchset #1 (id:1) has been deleted

[mcasas, 2016-08-02 22:34:02]

mcasas@chromium.org changed reviewers:
+ reillyg@chromium.org

[mcasas, 2016-08-02 22:34:02]

reillyg@, tiny CL PTAL

[Reilly Grant (use Gerrit), 2016-08-02 22:38:36]

lgtm

[mcasas, 2016-08-02 22:43:01]

The CQ bit was checked by mcasas@chromium.org

[commit-bot: I haz the power, 2016-08-02 22:43:39]

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, 2016-08-03 00:22:38]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2016-08-03 00:24:07]

Description was changed from

==========
MediaRecorder: add mime type to recorded blobs

... which was forgotten.

This CL also extends appropriately the LayoutTest (and does a micro fix).

BUG=615940
==========

to

==========
MediaRecorder: add mime type to recorded blobs

... which was forgotten.

This CL also extends appropriately the LayoutTest (and does a micro fix).

BUG=615940

Committed: https://crrev.com/3e7d8241bc996051f1617b08656b2687cff0a1a0
Cr-Commit-Position: refs/heads/master@{#409397}
==========

[commit-bot: I haz the power, 2016-08-03 00:24:08]

Patchset 2 (id:??) landed as
https://crrev.com/3e7d8241bc996051f1617b08656b2687cff0a1a0
Cr-Commit-Position: refs/heads/master@{#409397}