Oilpan: move platform speech objects to the heap.

Source/modules/speech/SpeechSynthesisVoice.cpp

Index: Source/modules/speech/SpeechSynthesisVoice.cpp
diff --git a/Source/modules/speech/SpeechSynthesisVoice.cpp b/Source/modules/speech/SpeechSynthesisVoice.cpp
index b42514cd27ec8d3c2e207a4c6813d6a4e5244d22..83ec578d41cc5592ca3d3d0de35d6b7ce050fb2c 100644
--- a/Source/modules/speech/SpeechSynthesisVoice.cpp
+++ b/Source/modules/speech/SpeechSynthesisVoice.cpp
@@ -28,15 +28,20 @@
 
 namespace WebCore {
 
-SpeechSynthesisVoice* SpeechSynthesisVoice::create(PassRefPtr<PlatformSpeechSynthesisVoice> voice)
+SpeechSynthesisVoice* SpeechSynthesisVoice::create(PlatformSpeechSynthesisVoice* voice)
 {
     return new SpeechSynthesisVoice(voice);
 }
 
-SpeechSynthesisVoice::SpeechSynthesisVoice(PassRefPtr<PlatformSpeechSynthesisVoice> voice)
+SpeechSynthesisVoice::SpeechSynthesisVoice(PlatformSpeechSynthesisVoice* voice)
     : m_platformVoice(voice)
 {
     ScriptWrappable::init(this);
 }
 
+void SpeechSynthesisVoice::trace(Visitor* visitor)
+{
+    visitor->trace(m_platformVoice);
+}
+
 } // namespace WebCore