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

Source/bindings/core/v8/ExceptionStatePlaceholder.h

Index: Source/bindings/core/v8/ExceptionStatePlaceholder.h
diff --git a/Source/bindings/core/v8/ExceptionStatePlaceholder.h b/Source/bindings/core/v8/ExceptionStatePlaceholder.h
index 222ead754552a84de59b71f8dd3cdcaee4675c42..9705c5d59cc087050be95c050eb715219a041f37 100644
--- a/Source/bindings/core/v8/ExceptionStatePlaceholder.h
+++ b/Source/bindings/core/v8/ExceptionStatePlaceholder.h
@@ -47,9 +47,9 @@ class IgnorableExceptionState final : public ExceptionState {
 public:
     IgnorableExceptionState(): ExceptionState(ExceptionState::UnknownContext, 0, 0, v8::Local<v8::Object>(), 0) { }
     ExceptionState& returnThis() { return *this; }
-    virtual void throwDOMException(const ExceptionCode&, const String& message = String()) override { }
-    virtual void throwTypeError(const String& message = String()) override { }
-    virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) override { }
+    void throwDOMException(const ExceptionCode&, const String& message = String()) override { }
+    void throwTypeError(const String& message = String()) override { }
+    void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) override { }
 };
 
 #define IGNORE_EXCEPTION (::blink::IgnorableExceptionState().returnThis())
@@ -60,9 +60,9 @@ class CORE_EXPORT NoExceptionStateAssertionChecker final : public ExceptionState
 public:
     NoExceptionStateAssertionChecker(const char* file, int line);
     ExceptionState& returnThis() { return *this; }
-    virtual void throwDOMException(const ExceptionCode&, const String& message = String()) override;
-    virtual void throwTypeError(const String& message = String()) override;
-    virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) override;
+    void throwDOMException(const ExceptionCode&, const String& message = String()) override;
+    void throwTypeError(const String& message = String()) override;
+    void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) override;
 
 private:
     const char* m_file;