Update HTML canvas classes to use OVERRIDE / FINAL when needed

Source/core/html/canvas/ANGLEInstancedArrays.h

Index: Source/core/html/canvas/ANGLEInstancedArrays.h
diff --git a/Source/core/html/canvas/ANGLEInstancedArrays.h b/Source/core/html/canvas/ANGLEInstancedArrays.h
index ff96f55ff727541bbbb1a261ce2daa2d13f65152..5004ec2c77fd2071fa06c52fea428722c78f0ca9 100644
--- a/Source/core/html/canvas/ANGLEInstancedArrays.h
+++ b/Source/core/html/canvas/ANGLEInstancedArrays.h
@@ -38,14 +38,14 @@ namespace WebCore {
 
 class WebGLRenderingContext;
 
-class ANGLEInstancedArrays : public WebGLExtension, public ScriptWrappable {
+class ANGLEInstancedArrays FINAL : public WebGLExtension, public ScriptWrappable {
 public:
     static PassRefPtr<ANGLEInstancedArrays> create(WebGLRenderingContext*);
     static bool supported(WebGLRenderingContext*);
     static const char* extensionName();
 
     virtual ~ANGLEInstancedArrays();
-    virtual ExtensionName name() const;
+    virtual ExtensionName name() const OVERRIDE;
 
     void drawArraysInstancedANGLE(GLenum mode, GLint first, GLsizei count, GLsizei primcount);
     void drawElementsInstancedANGLE(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei primcount);