Rename EOpFaceForward to EOpFaceforward.

This mirrors the spec naming and makes auto-gen a little easier.

BUG=chromium:697758

Change-Id: I9bcbc2c874b9a93a6d542aedf2b239f01ee708ce
Reviewed-on: https://chromium-review.googlesource.com/526393
Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/src/compiler/translator/Intermediate.cpp b/src/compiler/translator/Intermediate.cpp
index 37e1123..dae539e 100644
--- a/src/compiler/translator/Intermediate.cpp
+++ b/src/compiler/translator/Intermediate.cpp
@@ -285,7 +285,7 @@
         case EOpDistance:
         case EOpDot:
         case EOpCross:
-        case EOpFaceForward:
+        case EOpFaceforward:
         case EOpReflect:
         case EOpRefract:
         case EOpBitfieldExtract: