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

Source/platform/graphics/GeneratedImage.h

Index: Source/platform/graphics/GeneratedImage.h
diff --git a/Source/platform/graphics/GeneratedImage.h b/Source/platform/graphics/GeneratedImage.h
index be2cf1d9005b56f4b5417f78e03bdbd509937662..ae8e75c6edde03cf20f84aeea7606e3be85a77c9 100644
--- a/Source/platform/graphics/GeneratedImage.h
+++ b/Source/platform/graphics/GeneratedImage.h
@@ -34,18 +34,18 @@ namespace blink {
 
 class PLATFORM_EXPORT GeneratedImage : public Image {
 public:
-    virtual bool currentFrameHasSingleSecurityOrigin() const override { return true; }
+    bool currentFrameHasSingleSecurityOrigin() const override { return true; }
 
-    virtual void setContainerSize(const IntSize& size) override { m_size = size; }
-    virtual bool usesContainerSize() const override { return true; }
-    virtual bool hasRelativeWidth() const override { return true; }
-    virtual bool hasRelativeHeight() const override { return true; }
-    virtual void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) override;
+    void setContainerSize(const IntSize& size) override { m_size = size; }
+    bool usesContainerSize() const override { return true; }
+    bool hasRelativeWidth() const override { return true; }
+    bool hasRelativeHeight() const override { return true; }
+    void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) override;
 
-    virtual IntSize size() const override { return m_size; }
+    IntSize size() const override { return m_size; }
 
     // Assume that generated content has no decoded data we need to worry about
-    virtual void destroyDecodedData(bool) override { }
+    void destroyDecodedData(bool) override { }
 
 protected:
     void drawPattern(GraphicsContext*, const FloatRect&,
@@ -53,7 +53,7 @@ protected:
         const FloatRect&, const IntSize& repeatSpacing) final;
 
     // FIXME: Implement this to be less conservative.
-    virtual bool currentFrameKnownToBeOpaque() override { return false; }
+    bool currentFrameKnownToBeOpaque() override { return false; }
 
     GeneratedImage(const IntSize& size) : m_size(size) { }