IDL: Drop value conversion (V8 -> C++) macros from generated code

Source/bindings/core/v8/ExceptionState.h

Index: Source/bindings/core/v8/ExceptionState.h
diff --git a/Source/bindings/core/v8/ExceptionState.h b/Source/bindings/core/v8/ExceptionState.h
index 3acd126e8b3af60582f566143500b7c7a8bcb119..9683f5ded5f3fbad29e60aef5fd9df5315ba4ff5 100644
--- a/Source/bindings/core/v8/ExceptionState.h
+++ b/Source/bindings/core/v8/ExceptionState.h
@@ -96,6 +96,8 @@ public:
         return true;
     }
 
+    void throwException();
+
     // This method clears out the exception which |this| has.
     ScriptPromise reject(ScriptState*);
 
@@ -121,7 +123,6 @@ protected:
 
 private:
     void setException(v8::Handle<v8::Value>);
-    void throwException();
 
     String addExceptionContext(const String&) const;