Took newly community approved WebGL extensions out of draft status

Source/core/html/canvas/WebGLRenderingContextBase.h

Index: Source/core/html/canvas/WebGLRenderingContextBase.h
diff --git a/Source/core/html/canvas/WebGLRenderingContextBase.h b/Source/core/html/canvas/WebGLRenderingContextBase.h
index ca08a621efc166b289a7326af6a861c2fd9a195b..afa9619774cb74963830b03384933c9c9343b893 100644
--- a/Source/core/html/canvas/WebGLRenderingContextBase.h
+++ b/Source/core/html/canvas/WebGLRenderingContextBase.h
@@ -542,9 +542,6 @@ protected:
         ApprovedExtension               = 0x00,
         // Extension that is behind the draft extensions runtime flag:
         DraftExtension                  = 0x01,
-        // Extension that is still in draft state, but has been selectively enabled by default under a prefix. Do not use
-        // this for enabling new draft extensions; use the DraftExtension flag instead, and do not use vendor prefixes:
-        EnabledDraftExtension           = 0x04,
     };
 
     class ExtensionTracker {