Use rtc::Buffer::size() instead of rtc::Buffer::length()

Use rtc::Buffer::size() instead of rtc::Buffer::length()

The latter is just a backwards-compatibility redirect to the former,
and I'm hoping to get rid of it.

Committed: https://crrev.com/8c4e8a9b19c909ca40fb0c7a674d22203e597c6a
Cr-Commit-Position: refs/heads/master@{#322473}

[kwiberg-chromium, 2015-03-26 13:07:20]

kwiberg@chromium.org changed reviewers:
+ perkj@chromium.org

[perkj_chrome, 2015-03-26 15:49:44]

The CQ bit was checked by perkj@chromium.org

[commit-bot: I haz the power, 2015-03-26 15:50:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1036653004/1

[perkj_chrome, 2015-03-26 15:50:00]

On 2015/03/26 13:07:42, kwiberg wrote:

lgtm

[commit-bot: I haz the power, 2015-03-26 15:50:01]

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

[commit-bot: I haz the power, 2015-03-26 15:50:02]

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.

[kwiberg-chromium, 2015-03-26 19:37:37]

The CQ bit was checked by kwiberg@chromium.org

[commit-bot: I haz the power, 2015-03-26 19:37:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1036653004/1

[kwiberg-chromium, 2015-03-26 19:37:47]

The CQ bit was unchecked by kwiberg@chromium.org

[kwiberg-chromium, 2015-03-26 19:41:03]

The CQ bit was checked by kwiberg@chromium.org

[commit-bot: I haz the power, 2015-03-26 19:41:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1036653004/1

[commit-bot: I haz the power, 2015-03-26 21:22:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-26 21:22:56]

Patchset 1 (id:??) landed as
https://crrev.com/8c4e8a9b19c909ca40fb0c7a674d22203e597c6a
Cr-Commit-Position: refs/heads/master@{#322473}