Update more platform classes to use OVERRIDE / FINAL when needed

Source/platform/network/WebSocketHandshakeRequest.h

Index: Source/platform/network/WebSocketHandshakeRequest.h
diff --git a/Source/platform/network/WebSocketHandshakeRequest.h b/Source/platform/network/WebSocketHandshakeRequest.h
index 87786fb8a0250fea3b743379b23cd467f2237591..b510fc026fe6991e148888a9d5c3255456ce49f4 100644
--- a/Source/platform/network/WebSocketHandshakeRequest.h
+++ b/Source/platform/network/WebSocketHandshakeRequest.h
@@ -39,7 +39,7 @@ class PLATFORM_EXPORT WebSocketHandshakeRequest : public HTTPRequest {
 public:
     static PassRefPtr<WebSocketHandshakeRequest> create(const String& requestMethod, const KURL& url) { return adoptRef(new WebSocketHandshakeRequest(requestMethod, url)); }
     static PassRefPtr<WebSocketHandshakeRequest> create() { return adoptRef(new WebSocketHandshakeRequest); }
-    ~WebSocketHandshakeRequest();
+    virtual ~WebSocketHandshakeRequest();
 
 private:
     WebSocketHandshakeRequest(const String& requestMethod, const KURL&);