[part 2] Make classes and structures in modules fast-allocated.

Source/modules/mediastream/NavigatorMediaStream.h

Index: Source/modules/mediastream/NavigatorMediaStream.h
diff --git a/Source/modules/mediastream/NavigatorMediaStream.h b/Source/modules/mediastream/NavigatorMediaStream.h
index 12cfb2774a97669898e730afcacdd85301e07862..b24f5d75e36e9b8a988615b519950cffee9c7da1 100644
--- a/Source/modules/mediastream/NavigatorMediaStream.h
+++ b/Source/modules/mediastream/NavigatorMediaStream.h
@@ -21,6 +21,7 @@
 #define NavigatorMediaStream_h
 
 #include "platform/heap/Handle.h"
+#include "wtf/Allocator.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/WTFString.h"
 
@@ -35,14 +36,11 @@ class NavigatorUserMediaErrorCallback;
 class NavigatorUserMediaSuccessCallback;
 
 class NavigatorMediaStream {
+    STATIC_ONLY(NavigatorMediaStream);
 public:
     static void webkitGetUserMedia(Navigator&, const MediaStreamConstraints&, NavigatorUserMediaSuccessCallback*, NavigatorUserMediaErrorCallback*, ExceptionState&);
 
     static void getMediaDevices(Navigator&, MediaDeviceInfoCallback*, ExceptionState&);
-
-private:
-    NavigatorMediaStream();
-    ~NavigatorMediaStream();
 };
 
 } // namespace blink