Make WebPrivatePtr capable of wrapping garbage collected objects.

public/web/WebSpeechGrammar.h

Index: public/web/WebSpeechGrammar.h
diff --git a/public/web/WebSpeechGrammar.h b/public/web/WebSpeechGrammar.h
index 6c6f1379fd070ac47e8d310a5981e5e8d47fa983..88487725a7bac8ad444fd6c7c3fe5564e910fe0a 100644
--- a/public/web/WebSpeechGrammar.h
+++ b/public/web/WebSpeechGrammar.h
@@ -27,8 +27,8 @@
 #define WebSpeechGrammar_h
 
 #include "../platform/WebCommon.h"
-#include "../platform/WebPrivatePtr.h"
 #include "../platform/WebURL.h"
+#include "../platform/WebWillBePrivateGarbageCollectedPtr.h"
 
 namespace WebCore {
 class SpeechGrammar;
@@ -49,12 +49,12 @@ public:
     BLINK_EXPORT void assign(const WebSpeechGrammar&);
 
 #if BLINK_IMPLEMENTATION
-    WebSpeechGrammar(const WTF::PassRefPtr<WebCore::SpeechGrammar>&);
-    WebSpeechGrammar& operator=(const WTF::PassRefPtr<WebCore::SpeechGrammar>&);
+    explicit WebSpeechGrammar(const PassRefPtrWillBeRawPtr<WebCore::SpeechGrammar>&);
+    WebSpeechGrammar& operator=(const PassRefPtrWillBeRawPtr<WebCore::SpeechGrammar>&);
 #endif
 
 private:
-    WebPrivatePtr<WebCore::SpeechGrammar> m_private;
+    WebWillBePrivateGarbageCollectedPtr<WebCore::SpeechGrammar> m_private;
 };
 
 } // namespace blink