Revert of gl programs rewrite

src/gpu/GrDrawState.h

Index: src/gpu/GrDrawState.h
diff --git a/src/gpu/GrDrawState.h b/src/gpu/GrDrawState.h
index a6115cc22de8986ca32fabd728b2795411da4d37..9d653e6f5c94a62e1fc7ee366026da0c646295e5 100644
--- a/src/gpu/GrDrawState.h
+++ b/src/gpu/GrDrawState.h
@@ -684,10 +684,7 @@
     /// Hints that when provided can enable optimizations.
     ////
 
-    enum Hints {
-        kVertexColorsAreOpaque_Hint = 0x1,
-        kLast_Hint = kVertexColorsAreOpaque_Hint
-    };
+    enum Hints { kVertexColorsAreOpaque_Hint = 0x1, };
 
     void setHint(Hints hint, bool value) { fHints = value ? (fHints | hint) : (fHints & ~hint); }