[Ozone] Initialize SurfaceFactoryOzone only in the EGL GLES2 case
[Ozone] Initialize SurfaceFactoryOzone only in the EGL GLES2 case

aura_unittests explicitly calls GLSurface::InitializeOneOffForTests in main().
The Ozone platform isn't initialized this early causing a CHECK failure when
trying to get SurfaceFactoryOzone.

At this point surface creation in unittests is handled by OSMesa, thus we don't
need SurfaceFactoryOzone initialized.

TBR=piman@chromium.org
NOTRY=true

TESTS=Ran aura_unittests manually using an Ozone build

Review URL: https://codereview.chromium.org/217003007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@260239 0039d316-1c4b-4281-b951-d872f2087c98

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