Add [c]begin() and [c]end() member functions to rtc::Buffer

Add [c]begin() and [c]end() member functions to rtc::Buffer

I can't believe it's been this long before I found out we didn't have
them...

BUG=none

Review-Url: https://codereview.webrtc.org/2804673002
Cr-Commit-Position: refs/heads/master@{#17544}
Committed: https://chromium.googlesource.com/external/webrtc/+/1ba21eb06339be822ab2074285efb6f2fdd6e2e9

[kwiberg-webrtc, 2017-04-05 12:49:25]

The CQ bit was checked by kwiberg@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-05 12:49:32]

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

[kwiberg-webrtc, 2017-04-05 13:11:54]

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

[henrika_webrtc, 2017-04-05 13:40:56]

lgtm

[ossu, 2017-04-05 13:41:38]

lgtm

[henrika_webrtc, 2017-04-05 13:54:20]

The CQ bit was checked by henrika@webrtc.org

[commit-bot: I haz the power, 2017-04-05 13:54:26]

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, 2017-04-05 14:38:07]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1491400460517950,
"parent_rev": "dea682d25b60820af862cfb8f35a761ef1597784", "commit_rev":
"1ba21eb06339be822ab2074285efb6f2fdd6e2e9"}

[commit-bot: I haz the power, 2017-04-05 14:38:10]

Description was changed from

==========
Add [c]begin() and [c]end() member functions to rtc::Buffer

I can't believe it's been this long before I found out we didn't have
them...

BUG=none
==========

to

==========
Add [c]begin() and [c]end() member functions to rtc::Buffer

I can't believe it's been this long before I found out we didn't have
them...

BUG=none

Review-Url: https://codereview.webrtc.org/2804673002
Cr-Commit-Position: refs/heads/master@{#17544}
Committed:
https://chromium.googlesource.com/external/webrtc/+/1ba21eb06339be822ab207428...
==========

[commit-bot: I haz the power, 2017-04-05 14:38:11]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/external/webrtc/+/1ba21eb06339be822ab207428...