Oilpan: move platform speech objects to the heap.

Source/platform/speech/PlatformSpeechSynthesisUtterance.cpp

Index: Source/platform/speech/PlatformSpeechSynthesisUtterance.cpp
diff --git a/Source/platform/speech/PlatformSpeechSynthesisUtterance.cpp b/Source/platform/speech/PlatformSpeechSynthesisUtterance.cpp
index 23f31c5d7a2e49aa74fc2b56552d38a8c09607f4..97e988a2f6b193f8f912fe990025d72da8a7481f 100644
--- a/Source/platform/speech/PlatformSpeechSynthesisUtterance.cpp
+++ b/Source/platform/speech/PlatformSpeechSynthesisUtterance.cpp
@@ -28,9 +28,9 @@
 
 namespace WebCore {
 
-PassRefPtr<PlatformSpeechSynthesisUtterance> PlatformSpeechSynthesisUtterance::create(PlatformSpeechSynthesisUtteranceClient* client)
+PlatformSpeechSynthesisUtterance* PlatformSpeechSynthesisUtterance::create(PlatformSpeechSynthesisUtteranceClient* client)
 {
-    return adoptRef(new PlatformSpeechSynthesisUtterance(client));
+    return new PlatformSpeechSynthesisUtterance(client);
 }
 
 PlatformSpeechSynthesisUtterance::PlatformSpeechSynthesisUtterance(PlatformSpeechSynthesisUtteranceClient* client)
@@ -41,4 +41,10 @@ PlatformSpeechSynthesisUtterance::PlatformSpeechSynthesisUtterance(PlatformSpeec
 {
 }
 
+void PlatformSpeechSynthesisUtterance::trace(Visitor* visitor)
+{
+    visitor->trace(m_client);
+    visitor->trace(m_voice);
+}
+
 } // namespace WebCore