Revert of Enable Oilpan by default in modules/speech/

Source/modules/speech/SpeechRecognitionAlternative.h

Index: Source/modules/speech/SpeechRecognitionAlternative.h
diff --git a/Source/modules/speech/SpeechRecognitionAlternative.h b/Source/modules/speech/SpeechRecognitionAlternative.h
index 1cffc074abdb4bb6f1428b1678f99fa84afc142a..8a0b5587e28acef4c637120dcb13e02f0fb6cfde 100644
--- a/Source/modules/speech/SpeechRecognitionAlternative.h
+++ b/Source/modules/speech/SpeechRecognitionAlternative.h
@@ -28,15 +28,16 @@
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
+#include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class ExecutionContext;
 
-class SpeechRecognitionAlternative : public GarbageCollectedFinalized<SpeechRecognitionAlternative>, public ScriptWrappable {
+class SpeechRecognitionAlternative : public RefCountedWillBeGarbageCollectedFinalized<SpeechRecognitionAlternative>, public ScriptWrappable {
 public:
-    static SpeechRecognitionAlternative* create(const String&, double);
+    static PassRefPtrWillBeRawPtr<SpeechRecognitionAlternative> create(const String&, double);
 
     const String& transcript() const { return m_transcript; }
     double confidence() const { return m_confidence; }