Add [WillBeGarbageCollected] to Event.idl

Source/modules/speech/SpeechSynthesisEvent.h

Index: Source/modules/speech/SpeechSynthesisEvent.h
diff --git a/Source/modules/speech/SpeechSynthesisEvent.h b/Source/modules/speech/SpeechSynthesisEvent.h
index 1e290a6d5a46ddd00a6f64c3060002d13197c27b..2e1351d4664446f1572c8867d2fedb08024900b3 100644
--- a/Source/modules/speech/SpeechSynthesisEvent.h
+++ b/Source/modules/speech/SpeechSynthesisEvent.h
@@ -33,8 +33,8 @@ namespace WebCore {
 
 class SpeechSynthesisEvent FINAL : public Event {
 public:
-    static PassRefPtr<SpeechSynthesisEvent> create();
-    static PassRefPtr<SpeechSynthesisEvent> create(const AtomicString& type, unsigned long charIndex, float elapsedTime, const String& name);
+    static PassRefPtrWillBeRawPtr<SpeechSynthesisEvent> create();
+    static PassRefPtrWillBeRawPtr<SpeechSynthesisEvent> create(const AtomicString& type, unsigned long charIndex, float elapsedTime, const String& name);
 
     unsigned long charIndex() const { return m_charIndex; }
     float elapsedTime() const { return m_elapsedTime; }