Revert of DevTools: enable Screencast in DEBUG_DEVTOOLS mode (https://codereview.chromium.org/375873002/)

Reason for revert:
Breaks docked DevTools

Original issue's description:
> DevTools: enable Screencast in DEBUG_DEVTOOLS mode
> 
> This is useful for debugging Screencast without an Android device.
> 
> BUG=None
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=281755

TBR=pfeldman@chromium.org,kaznacheev@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=None

Review URL: https://codereview.chromium.org/379123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@281990 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed