Update config names for WebRTC extended filter echo cancellation

Update config names for WebRTC extended filter echo cancellation

This change switches from the old config and constraint names
(DelayCorrection and kExperimentalEchoCancellation) to the new ones
(ExtendedFilter and kExtendedFilterEchoCancellation). The old names
are deprecated in WebRTC and will be removed.

BUG=webrtc:4696
Committed: https://crrev.com/08e7b741d616e1f155bb6c02332fffc50b7bbaa5
Cr-Commit-Position: refs/heads/master@{#333933}

[hlundin-chromium, 2015-06-10 12:57:13]

hlundin@chromium.org changed reviewers:
+ ajm@chromium.org, tommi@chromium.org

[hlundin-chromium, 2015-06-10 12:57:13]

hlundin@chromium.org changed required reviewers:
+ tommi@chromium.org

[hlundin-chromium, 2015-06-10 12:57:25]

The CQ bit was checked by hlundin@chromium.org

[commit-bot: I haz the power, 2015-06-10 12:57:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167343004/1

[commit-bot: I haz the power, 2015-06-10 12:57:41]

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

[commit-bot: I haz the power, 2015-06-10 12:57:42]

All required reviewers (with asterisk prefixes) have not yet approved this CL.

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[hlundin-chromium, 2015-06-10 12:57:56]

tommi, ajm,

Please, take a look.

Thanks!

[ajm, 2015-06-10 16:41:06]

lgtm

[tommi (sloooow) - chröme, 2015-06-11 11:17:58]

lgtm

[tommi (sloooow) - chröme, 2015-06-11 11:21:25]

The CQ bit was checked by tommi@chromium.org

[commit-bot: I haz the power, 2015-06-11 11:21:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167343004/1

[commit-bot: I haz the power, 2015-06-11 12:17:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-11 12:18:15]

Patchset 1 (id:??) landed as
https://crrev.com/08e7b741d616e1f155bb6c02332fffc50b7bbaa5
Cr-Commit-Position: refs/heads/master@{#333933}