Don't ASSERT shader compilation success in ShaderGL. This assertion was useful for debugging the initial implementation but it is becoming an issue in tryjobs where tests will hang instead of fail due to driver bugs. BUG=angleproject:882 Change-Id: Ib23a0d16dfe250ea175a166b5e277bf07d80a2fa Reviewed-on: https://chromium-review.googlesource.com/307460 Tryjob-Request: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>