DOMWebSocket::bufferedAmount() should not return an "unsigned long"

Source/modules/websockets/DOMWebSocket.h

Index: Source/modules/websockets/DOMWebSocket.h
diff --git a/Source/modules/websockets/DOMWebSocket.h b/Source/modules/websockets/DOMWebSocket.h
index 48ab9660d0994b1606448c24f46c026832f6429f..7327ab18892a2b958d4486f028ab064c3d429c8c 100644
--- a/Source/modules/websockets/DOMWebSocket.h
+++ b/Source/modules/websockets/DOMWebSocket.h
@@ -89,7 +89,7 @@ public:
 
     const KURL& url() const;
     State readyState() const;
-    unsigned long bufferedAmount() const;
+    unsigned bufferedAmount() const;
 
     String protocol() const;
     String extensions() const;
@@ -201,7 +201,7 @@ private:
 
     // Updates m_bufferedAmountAfterClose given the amount of data passed to
     // send() method after the state changed to CLOSING or CLOSED.
-    void updateBufferedAmountAfterClose(unsigned long);
+    void updateBufferedAmountAfterClose(unsigned);
     void reflectBufferedAmountConsumption(Timer<DOMWebSocket>*);
 
     void releaseChannel();
@@ -215,11 +215,11 @@ private:
 
     State m_state;
     KURL m_url;
-    unsigned long m_bufferedAmount;
+    unsigned m_bufferedAmount;
     // The consumed buffered amount that will be reflected to m_bufferedAmount
     // later. It will be cleared once reflected.
-    unsigned long m_consumedBufferedAmount;
-    unsigned long m_bufferedAmountAfterClose;
+    unsigned m_consumedBufferedAmount;
+    unsigned m_bufferedAmountAfterClose;
     BinaryType m_binaryType;
     // The subprotocol the server selected.
     String m_subprotocol;