Revert "Validate that attrib offsets don't overflow buffers." Seems to fail the Windows 8 bots in FL9_3 for some reason. https://build.chromium.org/p/chromium.gpu.fyi/builders/Win8%20Release%20%28NVIDIA%29/builds/20703 VertexAttributeTest.ShortNormalized_ES2_D3D11_9_3 VertexAttributeTest.ShortUnnormalized_ES2_D3D11_9_3 BUG=angleproject:1339 This reverts commit fb57c04c781df708a432f0e90acf2e431b7983bb. Change-Id: I4c678ff6b337e9a3e0a1fc809f96f6b89407ea33 Reviewed-on: https://chromium-review.googlesource.com/332442 Reviewed-by: Jamie Madill <jmadill@chromium.org>