Recompile.

src/Web.js

@@ -1337,7 +1337,7 @@ var $1,$receiver;
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = true,
 //>>excludeEnd("ctx");
-($globals.HTMLCanvas.superclass||$boot.dnu).fn.prototype._initialize.apply($recv(self), []));
+($globals.HTMLCanvas.superclass||$boot.nilAsClass).fn.prototype._initialize.apply($recv(self), []));
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = false;
 //>>excludeEnd("ctx");;
@@ -2954,7 +2954,7 @@ $2=(
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = true,
 //>>excludeEnd("ctx");
-($globals.HTMLSnippet.klass.superclass||$boot.dnu).fn.prototype._new.apply($recv(self), []));
+($globals.HTMLSnippet.klass.superclass||$boot.nilAsClass).fn.prototype._new.apply($recv(self), []));
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = false;
 //>>excludeEnd("ctx");;
@@ -2992,7 +2992,7 @@ var $1;
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = true,
 //>>excludeEnd("ctx");
-($globals.HTMLSnippet.klass.superclass||$boot.dnu).fn.prototype._initialize.apply($recv(self), []));
+($globals.HTMLSnippet.klass.superclass||$boot.nilAsClass).fn.prototype._initialize.apply($recv(self), []));
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = false;
 //>>excludeEnd("ctx");;