Don't use => on void functions.

sdk/lib/web_audio/dartium/web_audio_dartium.dart

Index: sdk/lib/web_audio/dartium/web_audio_dartium.dart
diff --git a/sdk/lib/web_audio/dartium/web_audio_dartium.dart b/sdk/lib/web_audio/dartium/web_audio_dartium.dart
index c73b31b602cd1d937ff75e24098a0f2012f594de..6fd53560c865f23c42a52905f9b6423ffbc47314 100644
--- a/sdk/lib/web_audio/dartium/web_audio_dartium.dart
+++ b/sdk/lib/web_audio/dartium/web_audio_dartium.dart
@@ -689,12 +689,14 @@ class AudioNode extends EventTarget {
   }
 
   @DomName('AudioNode.connect')
-  void connectNode(AudioNode destination, [int output = 0, int input = 0]) =>
-      _connect(destination, output, input);
+  void connectNode(AudioNode destination, [int output = 0, int input = 0]) {
+    _connect(destination, output, input);
+  }
 
   @DomName('AudioNode.connect')
-  void connectParam(AudioParam destination, [int output = 0]) =>
-      _connect(destination, output);
+  void connectParam(AudioParam destination, [int output = 0]) {
+    _connect(destination, output);
+  }
 }
 // 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