Remove invalid portion of test

tests/html/audiocontext_test.dart

 library AudioContextTest;
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 import 'dart:typed_data';
 import 'dart:web_audio';
 import 'dart:async';
 
 main() {
 
@@ skipping 10 matching lines @@
 
   group('functional', () {
     test('constructorTest', () {
       if(AudioContext.supported) {
         var ctx = new AudioContext();
         expect(ctx, isNotNull);
         expect(ctx, isAudioContext);
       }
     });
 
-    test('createBuffer', () {
-      if(AudioContext.supported) {
-        var ctx = new AudioContext();
-        Float32List view = new Float32List.fromList([]);
-        try {
-          // Test that native overload is chosen correctly. Native
-          // implementation should throw 'SyntaxError' DomException because the
-          // buffer is empty.
-          AudioBuffer buffer = ctx.createBufferFromBuffer(view.buffer, false);
-        } catch (e) {
-          expect(e.name, DomException.SYNTAX);
-        }
-      }
-    });
-
     test('audioRenames', () {
       if(AudioContext.supported) {
         AudioContext context = new AudioContext();
         GainNode gainNode = context.createGain();
         gainNode.connectNode(context.destination);
         expect(gainNode is GainNode, isTrue);
 
         expect(context.createAnalyser() is AnalyserNode, isTrue);
         expect(context.createChannelMerger() is AudioNode, isTrue);
         expect(context.createChannelSplitter() is AudioNode, isTrue);
@@ skipping 47 matching lines @@
 
         expect(() => oscillator.type = 7, throws);
         expect(oscillator.type, equals('triangle'));
 
         expect(() => oscillator.type = ['heap object not a string'], throws);
         expect(oscillator.type, equals('triangle'));
       }
     });
   });
 }