Revert of Allow creating context for cc worker thread. (patchset #5 id:80001 of https://codereview.chromium.org/
898453007/)
Reason for revert:
Broke libcontent.dylib build on mac debug builder: http://build.chromium.org/p/chromium.webkit/builders/Mac%20Builder%20%28dbg%29/builds/74405/steps/compile/logs/stdio
Original issue's description:
> Allow creating context for cc worker thread.
>
> An additional context can be provided by the OutputSurface. This will be used for cc/ to create a context on its worker thread.
>
> Committed: https://crrev.com/
3702467b0a7c261bdf8700597c76e51dc39a449c
> Cr-Commit-Position: refs/heads/master@{#315469}
TBR=piman@chromium.org,jbauman@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Review URL: https://codereview.chromium.org/
915523003
Cr-Commit-Position: refs/heads/master@{#315552}