Update to use third_party/webrtc_overrides instead of third_party/webrtc/overrides.

Update to use third_party/webrtc_overrides instead of third_party/webrtc/overrides.

This is one step in moving the overrides files from WebRTC to Chromium. See bug comment #65 for all steps.

Depends on https://codereview.chromium.org/1345873004/ and a WebRTC roll (specifically https://codereview.webrtc.org/1345313004/).

BUG=468375
Committed: https://crrev.com/d1971c56ac15008bde9caef79e90ace1113be32f
Cr-Commit-Position: refs/heads/master@{#351554}

[Henrik Grunell, 2015-09-21 10:39:27]

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

[Henrik Grunell, 2015-09-21 10:42:43]

grunell@chromium.org changed reviewers:
+ kjellander@chromium.org

[Henrik Grunell, 2015-09-21 10:43:20]

grunell@chromium.org changed reviewers:
+ sergeyu@chromium.org

[Henrik Grunell, 2015-09-21 10:45:05]

Per: content/renderer/media/*
Sergey: jingle/*
Henrik K: third_party/libjingle/*

[kjellander_chromium, 2015-09-21 10:51:01]

On 2015/09/21 10:45:05, Henrik Grunell wrote:
> Per: content/renderer/media/*
> Sergey: jingle/*
> Henrik K: third_party/libjingle/*

third_party/libjingle/*: lgtm

[Sergey Ulanov, 2015-09-21 19:02:05]

lgtm

[perkj_chrome, 2015-09-22 07:30:52]

lgtm

[Henrik Grunell, 2015-09-30 13:18:58]

The CQ bit was checked by grunell@chromium.org

[Henrik Grunell, 2015-09-30 13:18:59]

The patchset sent to the CQ was uploaded after l-g-t-m from perkj@chromium.org,
kjellander@chromium.org, sergeyu@chromium.org
Link to the patchset: https://codereview.chromium.org/1357913002/#ps20001
(title: "Rebase.")

[commit-bot: I haz the power, 2015-09-30 13:19:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1357913002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1357913002/20001

[commit-bot: I haz the power, 2015-09-30 14:52:50]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-30 14:53:46]

Patchset 2 (id:??) landed as
https://crrev.com/d1971c56ac15008bde9caef79e90ace1113be32f
Cr-Commit-Position: refs/heads/master@{#351554}