Update IDL to Chrome 32

modules/speech/SpeechSynthesis.idl

Index: modules/speech/SpeechSynthesis.idl
diff --git a/modules/speech/SpeechSynthesis.idl b/modules/speech/SpeechSynthesis.idl
index 4fa847a3399f97f54a2585e272e657274143629c..a88e4968efebd4820bfff8142bc1d8ed3f923ac8 100644
--- a/modules/speech/SpeechSynthesis.idl
+++ b/modules/speech/SpeechSynthesis.idl
@@ -25,15 +25,17 @@
 
 [
     NoInterfaceObject,
-    EnabledAtRuntime=SpeechSynthesis
-] interface SpeechSynthesis  {
+    RuntimeEnabled=SpeechSynthesis
+] interface SpeechSynthesis : EventTarget {
     readonly attribute boolean pending;
     readonly attribute boolean speaking;
     readonly attribute boolean paused;
 
-    void speak(SpeechSynthesisUtterance utterance);
+    [RaisesException] void speak(SpeechSynthesisUtterance utterance);
     void cancel();
     void pause();
     void resume();
     sequence<SpeechSynthesisVoice> getVoices();
+
+    attribute EventHandler onvoiceschanged;
 };