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

Source/platform/fonts/GlyphPageTreeNode.h

Index: Source/platform/fonts/GlyphPageTreeNode.h
diff --git a/Source/platform/fonts/GlyphPageTreeNode.h b/Source/platform/fonts/GlyphPageTreeNode.h
index eba2adc5e2709317f7d3bb7cb7f949fc74bf4837..a6fac281d94fdd0b563b7faee43b56000695966a 100644
--- a/Source/platform/fonts/GlyphPageTreeNode.h
+++ b/Source/platform/fonts/GlyphPageTreeNode.h
@@ -108,7 +108,7 @@ public:
     void pruneCustomFontData(const FontData*);
     void pruneFontData(const SimpleFontData*, unsigned level = 0);
 
-    virtual GlyphPage* page(UScriptCode = USCRIPT_COMMON) override final { return m_page.get(); }
+    GlyphPage* page(UScriptCode = USCRIPT_COMMON) final { return m_page.get(); }
 
     GlyphPageTreeNodeBase* getChild(const FontData*, unsigned pageNumber);
     GlyphPageTreeNode* getNormalChild(const FontData*, unsigned pageNumber);
@@ -141,7 +141,7 @@ private:
 
 class PLATFORM_EXPORT SystemFallbackGlyphPageTreeNode : public GlyphPageTreeNodeBase {
 public:
-    virtual GlyphPage* page(UScriptCode = USCRIPT_COMMON) override final;
+    GlyphPage* page(UScriptCode = USCRIPT_COMMON) final;
 
 private:
     friend class GlyphPageTreeNode;