Cast Extensions API: Major namespace and object renaming

Cast Extensions API: Major namespace and object renaming

There is no functional change in this patch. This change only does
renaming.

Extensions API namespaces:
webrtc.castSendTransport -> cast.streaming.rtpStream
webrtc.castUdpTransport -> cast.streaming.udpTransport

Class renaming:
WebRtcNativeHandler -> CastStreamingNativeHandler
CastSendTransport -> CastRtpStream

Tests and related files are also renamed to get rid of the webrtc
label.

BUG=301920
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=238403

[haibinlu, 2013-11-27 01:06:13]

lgtm

[Alpha Left Google, 2013-11-27 21:34:11]

+kalman +scherkus

[scherkus (not reviewing), 2013-11-27 22:09:39]

lgtm

[Alpha Left Google, 2013-11-28 00:17:05]

+thakis for owners approval for
chrome/renderer/resources/renderer_resources.grd.

[Nico, 2013-11-28 00:18:23]

lgtm

[not at google - send to devlin, 2013-12-02 23:12:16]

lgtm

[commit-bot: I haz the power, 2013-12-03 01:56:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hclam@chromium.org/90083002/60001

[commit-bot: I haz the power, 2013-12-03 02:22:55]

Retried try job too often on linux_rel for step(s) base_unittests,
browser_tests, interactive_ui_tests, net_unittests, unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-12-03 05:12:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hclam@chromium.org/90083002/80001

[commit-bot: I haz the power, 2013-12-03 15:45:47]

Change committed as 238403