Revert of Implement argument validation for chrome.cast.channel.{open,send}

Revert of Implement argument validation for chrome.cast.channel.{open,send} (https://codereview.chromium.org/255443002/)

Reason for revert:
Causing leaks: http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%282%29/builds/2069

Original issue's description:
> Implement argument validation for chrome.cast.channel.{open,send}
> 
> TESTED=Unit test.  Manually with Cast extension
> BUG=331165
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266804

TBR=munjal@chromium.org,imcheng@chromium.org,mfoltz@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=331165
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266833

[Michael Achenbach, 2014-04-29 10:47:51]

Created Revert of Implement argument validation for
chrome.cast.channel.{open,send}

[commit-bot: I haz the power, 2014-04-29 10:48:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/machenbach@chromium.org/256333002/1

[commit-bot: I haz the power, 2014-04-29 10:48:39]

Change committed as 266833