Handle super-method invocations in CPS->JS backend.

pkg/compiler/lib/src/use_unused_api.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
@@ skipping 234 matching lines @@
     ..visitParameter(null);
   task
     ..hasIr(null)
     ..getIr(null);
   builder
     ..buildIntegerLiteral(null)
     ..buildDoubleLiteral(null)
     ..buildBooleanLiteral(null)
     ..buildNullLiteral()
     ..buildStringLiteral(null)
-    ..buildDynamicGet(null, null)
-    ..buildSuperGet(null);
+    ..buildDynamicGet(null, null);
 }
 
 useCompiler(dart2jslib.Compiler compiler) {
   compiler.libraryLoader
       ..reset()
       ..resetAsync(null)
       ..lookupLibrary(null);
   compiler.forgetElement(null);
 }
 
 useTypes() {
   new dart_types.ResolvedTypedefType(null, null, null).unalias(null);
 }
 
 useCodeEmitterTask(js_emitter.CodeEmitterTask codeEmitterTask) {
   codeEmitterTask.oldEmitter.clearCspPrecompiledNodes();
 }
 
 useScript(dart2jslib.Script script) {
   script.copyWithFile(null);
 }