Update web classes to use OVERRIDE / FINAL when needed

Source/web/BackForwardClientImpl.h

Index: Source/web/BackForwardClientImpl.h
diff --git a/Source/web/BackForwardClientImpl.h b/Source/web/BackForwardClientImpl.h
index efc9e5afd81adb3220ff77c8707b59c733874a28..780f1e425dc6f7aee1b979b833de89e94940759e 100644
--- a/Source/web/BackForwardClientImpl.h
+++ b/Source/web/BackForwardClientImpl.h
@@ -36,16 +36,16 @@
 namespace blink {
 class WebViewImpl;
 
-class BackForwardClientImpl : public WebCore::BackForwardClient {
+class BackForwardClientImpl FINAL : public WebCore::BackForwardClient {
 public:
     explicit BackForwardClientImpl(WebViewImpl*);
     virtual ~BackForwardClientImpl();
 
 private:
     // WebCore::BackForwardList methods:
-    virtual int backListCount();
-    virtual int forwardListCount();
-    virtual int backForwardListCount();
+    virtual int backListCount() OVERRIDE;
+    virtual int forwardListCount() OVERRIDE;
+    virtual int backForwardListCount() OVERRIDE;
 
     WebViewImpl* m_webView;
 };