Revert of Temporarily disabling -c3 slaves. (patchset #1 id:1 of https://codereview.chromium.org/1307953002/ )
Revert of Temporarily disabling -c3 slaves. (patchset #1 id:1 of https://codereview.chromium.org/1307953002/ )

Reason for revert:
The culprit for this has been found and these slaves can be re-added (they were innocent).

Original issue's description:
> Temporarily disabling -c3 slaves.
> 
> These slaves create incomplete builds for some reason,
> and fail to build the video_engine_core_unittests 
> target. Why this just happens for -c3 machines is a 
> very good question. This patch will at least green 
> up the WebRTC tree until someone can dig deeper.
> 
> BUG=webrtc:4935
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=296408

TBR=phajdan.jr@chromium.org,phoglund@webrtc.org,phoglund@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:4935

Review URL: https://codereview.chromium.org/1347033002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@296708 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build