Move FunctionView from AudioCodingModule to the rtc namespace

Move FunctionView from AudioCodingModule to the rtc namespace

It's a very general type, and we're about to start needing it in other
places besides AudioCodingModule.

BUG=webrtc:5801
Committed: https://crrev.com/24c7c1238debd97ec580611800a90888f5c43a88
Cr-Commit-Position: refs/heads/master@{#14423}

[kwiberg-webrtc, 2016-09-28 10:48:45]

kwiberg@webrtc.org changed reviewers:
+ ossu@webrtc.org

[kwiberg-webrtc, 2016-09-28 10:48:45]

I decided to punt on function pointer support; I think I know how exactly to do
it, but we don't currently need it. So here's the same old version of
FunctionView, just moved to webrtc/base/. (And fixed so that copy construction
works like you'd expect, instead of making the new object point at the old one.)

[ossu, 2016-09-28 13:47:36]

Agreed. It's not critical to get bogged down by that use-case right now. LGTM!

[kwiberg-webrtc, 2016-09-28 16:51:51]

The CQ bit was checked by kwiberg@webrtc.org

[commit-bot: I haz the power, 2016-09-28 16:51:57]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-09-28 18:57:16]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-28 18:57:23]

Description was changed from

==========
Move FunctionView from AudioCodingModule to the rtc namespace

It's a very general type, and we're about to start needing it in other
places besides AudioCodingModule.

BUG=webrtc:5801
==========

to

==========
Move FunctionView from AudioCodingModule to the rtc namespace

It's a very general type, and we're about to start needing it in other
places besides AudioCodingModule.

BUG=webrtc:5801

Committed: https://crrev.com/24c7c1238debd97ec580611800a90888f5c43a88
Cr-Commit-Position: refs/heads/master@{#14423}
==========

[commit-bot: I haz the power, 2016-09-28 18:57:25]

Patchset 2 (id:??) landed as
https://crrev.com/24c7c1238debd97ec580611800a90888f5c43a88
Cr-Commit-Position: refs/heads/master@{#14423}