[WIP]Add WebPrivateHeapPtr and use it for speech platform layer.

Source/core/speech/SpeechInputResultList.h

Index: Source/core/speech/SpeechInputResultList.h
diff --git a/Source/core/speech/SpeechInputResultList.h b/Source/core/speech/SpeechInputResultList.h
index 3edb9d5bef0638a0a85e30a074672602d15d4bb0..a51ad9bcdea7c14c0a5f15242cd9fb7edac24136 100644
--- a/Source/core/speech/SpeechInputResultList.h
+++ b/Source/core/speech/SpeechInputResultList.h
@@ -30,19 +30,23 @@
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/speech/SpeechInputResult.h"
+#include "heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class SpeechInputResultList : public RefCounted<SpeechInputResultList>, public ScriptWrappable {
+class SpeechInputResultList : public RefCountedWillBeGarbageCollectedFinalized<SpeechInputResultList>, public ScriptWrappable {
+    DECLARE_GC_INFO;
 public:
-    static PassRefPtr<SpeechInputResultList> create(const SpeechInputResultArray& results);
+    static PassRefPtrWillBeRawPtr<SpeechInputResultList> create(const SpeechInputResultArray& results);
 
     // Methods from the IDL.
     size_t length() { return m_results.size(); }
     SpeechInputResult* item(unsigned index);
 
+    void trace(Visitor *);
+
 private:
     explicit SpeechInputResultList(const SpeechInputResultArray& results);