Remove meaningless uses of [TypeChecking=Nullable]

Source/core/html/canvas/WebGLRenderingContextBase.idl

Index: Source/core/html/canvas/WebGLRenderingContextBase.idl
diff --git a/Source/core/html/canvas/WebGLRenderingContextBase.idl b/Source/core/html/canvas/WebGLRenderingContextBase.idl
index 4f0de43de88a61cbccb979684d8e3cf9c9d7da23..46b68bb0c0288d6fd722b3cc2a4ad42680abf1db 100644
--- a/Source/core/html/canvas/WebGLRenderingContextBase.idl
+++ b/Source/core/html/canvas/WebGLRenderingContextBase.idl
@@ -41,11 +41,11 @@ typedef unrestricted float GLfloat;
 typedef unrestricted float GLclampf;
 
 [
-    // FIXME: [DoNotCheckConstants] and [TypeChecking=Interface|Nullable] should be applied
+    // FIXME: [DoNotCheckConstants] and [TypeChecking=Interface|Unrestricted] should be applied
     // to members and not need to be put on implementing interface
     // DoNotCheckConstants, // need to put on implementing interface
     NoInterfaceObject, // Always used on target of 'implements'
-    // TypeChecking=Interface|Nullable|Unrestricted, // need to put on implementing interface
+    // TypeChecking=Interface|Unrestricted, // need to put on implementing interface
 ] interface WebGLRenderingContextBase {
 
     readonly attribute HTMLCanvasElement canvas;