Linux: Fix DCHECK failure in Chrome caused by re-entrant rendering. This wasn't actually causing problems in release builds (presumably O3D was able to complete the re-entrant render action without problems), but we still don't want to do it.
Linux: Fix DCHECK failure in Chrome caused by re-entrant rendering. This wasn't actually causing problems in release builds (presumably O3D was able to complete the re-entrant render action without problems), but we still don't want to do it.

TEST=loaded a debug build repeatedly in Chrome/Linux and verified no DCHECK failure, whereas previously it happened a fair amount
BUG=none

Review URL: http://codereview.chromium.org/2944006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@51999 0039d316-1c4b-4281-b951-d872f2087c98

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