Failing to compile shaders which are used in some layout_tests,
see http://crbug.com/538692 for logs and bad shaders.

We should diagnose if the shaders are faulty or if there's a
bug in this CL and take appropriate action, but first priority 
is to get the tests running again.

BUG=538692
BUG=angleproject:1170

This reverts commit 16a79cd1.

Change-Id: Iea14c58d87041bcf5ba645b7076ba0936dea6b9d
Reviewed-on: https://chromium-review.googlesource.com/303794Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>