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

Source/bindings/core/v8/V8GCController.cpp

Index: Source/bindings/core/v8/V8GCController.cpp
diff --git a/Source/bindings/core/v8/V8GCController.cpp b/Source/bindings/core/v8/V8GCController.cpp
index 3c496ae2a398335ee891c1ab67ba5a5fc48d13cd..1f162db35d3b0c812f8b81c9b0f4574325e17140 100644
--- a/Source/bindings/core/v8/V8GCController.cpp
+++ b/Source/bindings/core/v8/V8GCController.cpp
@@ -108,7 +108,7 @@ public:
         : m_isolate(isolate)
     { }
 
-    virtual void VisitPersistentHandle(v8::Persistent<v8::Value>* value, uint16_t classId) override
+    void VisitPersistentHandle(v8::Persistent<v8::Value>* value, uint16_t classId) override
     {
         // A minor DOM GC can collect only Nodes.
         if (classId != WrapperTypeInfo::NodeClassId)
@@ -250,7 +250,7 @@ public:
     {
     }
 
-    virtual void VisitPersistentHandle(v8::Persistent<v8::Value>* value, uint16_t classId) override
+    void VisitPersistentHandle(v8::Persistent<v8::Value>* value, uint16_t classId) override
     {
         if (classId != WrapperTypeInfo::NodeClassId && classId != WrapperTypeInfo::ObjectClassId)
             return;
@@ -486,7 +486,7 @@ public:
     {
     }
 
-    virtual void VisitPersistentHandle(v8::Persistent<v8::Value>* value, uint16_t classId) override
+    void VisitPersistentHandle(v8::Persistent<v8::Value>* value, uint16_t classId) override
     {
         if (classId != WrapperTypeInfo::NodeClassId && classId != WrapperTypeInfo::ObjectClassId)
             return;