This reverts commit d842a6b2.

Because of WebglConformance_conformance_glsl_bugs_invariant_does_not_leak_across_shaders failure

BUG=chromium:659326

Change-Id: I0602e24f3d34ccf852cda865f673c5c7634f82a6
Reviewed-on: https://chromium-review.googlesource.com/403230Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>