Remove CDM_7 support

Remove CDM_7 support

All CDMs released since M43 support the CDM_8 interface, so remove
support for CDM_7 as it is no longer used.

BUG=640437
TEST=browser_tests pass

Committed: https://crrev.com/538ee12bbc6ec2cafb7267dd475647ba64514991
Cr-Commit-Position: refs/heads/master@{#414471}

[jrummell, 2016-08-24 22:48:56]

jrummell@chromium.org changed reviewers:
+ xhwang@chromium.org

[jrummell, 2016-08-24 22:48:57]

PTAL.

[xhwang, 2016-08-24 23:10:59]

lgtm

[jrummell, 2016-08-24 23:13:31]

The CQ bit was checked by jrummell@chromium.org

[commit-bot: I haz the power, 2016-08-24 23:14:43]

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, 2016-08-25 01:17:16]

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

[commit-bot: I haz the power, 2016-08-25 01:17:17]

Try jobs failed on following builders:
  linux_chromium_chromeos_compile_dbg_ng on master.tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[jrummell, 2016-08-25 17:03:07]

The CQ bit was checked by jrummell@chromium.org

[commit-bot: I haz the power, 2016-08-25 17:03:41]

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, 2016-08-25 18:07:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-25 18:12:24]

Description was changed from

==========
Remove CDM_7 support

All CDMs released since M43 support the CDM_8 interface, so remove
support for CDM_7 as it is no longer used.

BUG=640437
TEST=browser_tests pass
==========

to

==========
Remove CDM_7 support

All CDMs released since M43 support the CDM_8 interface, so remove
support for CDM_7 as it is no longer used.

BUG=640437
TEST=browser_tests pass

Committed: https://crrev.com/538ee12bbc6ec2cafb7267dd475647ba64514991
Cr-Commit-Position: refs/heads/master@{#414471}
==========

[commit-bot: I haz the power, 2016-08-25 18:12:24]

Patchset 1 (id:??) landed as
https://crrev.com/538ee12bbc6ec2cafb7267dd475647ba64514991
Cr-Commit-Position: refs/heads/master@{#414471}