Update HTML canvas classes to use OVERRIDE / FINAL when needed

Source/core/html/canvas/OESTextureFloat.h

Index: Source/core/html/canvas/OESTextureFloat.h
diff --git a/Source/core/html/canvas/OESTextureFloat.h b/Source/core/html/canvas/OESTextureFloat.h
index 255c6741b11cf7acf49e206da7e8d72e907de576..29b7fcc69456646d2815431e0834651b86c87ec2 100644
--- a/Source/core/html/canvas/OESTextureFloat.h
+++ b/Source/core/html/canvas/OESTextureFloat.h
@@ -32,14 +32,14 @@
 
 namespace WebCore {
 
-class OESTextureFloat : public WebGLExtension, public ScriptWrappable {
+class OESTextureFloat FINAL : public WebGLExtension, public ScriptWrappable {
 public:
     static PassRefPtr<OESTextureFloat> create(WebGLRenderingContext*);
     static bool supported(WebGLRenderingContext*);
     static const char* extensionName();
 
     virtual ~OESTextureFloat();
-    virtual ExtensionName name() const;
+    virtual ExtensionName name() const OVERRIDE;
 
 private:
     OESTextureFloat(WebGLRenderingContext*);