Rename the members of FrameReceiverConfig

Rename the members of FrameReceiverConfig

TODO(miu): rename feedback_ssrc to receiver_ssrc;
rename incoming_ssrc to sender_ssrc.

BUG=
R=miu@chromium.org

Committed: https://crrev.com/f2b52ebeaa5ad1d3f06c0597a830b56bfcc9dc86
Cr-Commit-Position: refs/heads/master@{#318314}

[zhuoyu.qian, 2015-02-26 07:13:59]

zhuoyu.qian@samsung.com changed reviewers:
+ miu@chromium.org
- mikhal@chromium.org

[zhuoyu.qian, 2015-02-26 07:15:40]

Hi miu,
Please have a look. Thank you.

[miu, 2015-02-26 20:12:16]

The CQ bit was checked by miu@chromium.org

[miu, 2015-02-26 20:12:17]

lgtm

[miu, 2015-02-26 20:12:39]

Thanks for the clean-up work!  :)

[commit-bot: I haz the power, 2015-02-26 20:13:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/916973003/1

[commit-bot: I haz the power, 2015-02-26 21:24:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-26 21:25:21]

Patchset 1 (id:??) landed as
https://crrev.com/f2b52ebeaa5ad1d3f06c0597a830b56bfcc9dc86
Cr-Commit-Position: refs/heads/master@{#318314}