Fix virtual/override/final usage in Source/modules/.

Source/modules/webgl/WebGLRenderingContext.h

Index: Source/modules/webgl/WebGLRenderingContext.h
diff --git a/Source/modules/webgl/WebGLRenderingContext.h b/Source/modules/webgl/WebGLRenderingContext.h
index b36ff09a3003af0129408d2fd9a4b19a9418b5a3..ed26f5aebedfe6665995faa1f3c5ffb2f43ac552 100644
--- a/Source/modules/webgl/WebGLRenderingContext.h
+++ b/Source/modules/webgl/WebGLRenderingContext.h
@@ -47,12 +47,12 @@ public:
         void onError(HTMLCanvasElement*, const String& error) override;
     };
 
-    virtual ~WebGLRenderingContext();
+    ~WebGLRenderingContext() override;
 
     CanvasRenderingContext::ContextType contextType() const override { return CanvasRenderingContext::ContextWebgl; }
-    virtual unsigned version() const override { return 1; }
-    virtual String contextName() const override { return "WebGLRenderingContext"; }
-    virtual void registerContextExtensions() override;
+    unsigned version() const override { return 1; }
+    String contextName() const override { return "WebGLRenderingContext"; }
+    void registerContextExtensions() override;
 
     EAGERLY_FINALIZE();
     DECLARE_VIRTUAL_TRACE();