IDL: Auto-generate NativeValueTraits for IDL dictionaries

Source/modules/encryptedmedia/NavigatorRequestMediaKeySystemAccess.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NavigatorRequestMediaKeySystemAccess_h
 #define NavigatorRequestMediaKeySystemAccess_h
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/V8Binding.h"
@@ skipping 27 matching lines @@
         const String& keySystem,
         const Vector<MediaKeySystemOptions>& supportedConfigurations);
 
     virtual void trace(Visitor*) override;
 
 private:
     NavigatorRequestMediaKeySystemAccess();
     static const char* supplementName();
 };
 
-// This is needed by the generated code for Navigator to convert a JavaScript
-// object into a MediaKeySystemOptions object.
-template <>
-struct NativeValueTraits<MediaKeySystemOptions> {
-    static inline MediaKeySystemOptions nativeValue(const v8::Handle<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)
-    {
-        MediaKeySystemOptions impl;
-        V8MediaKeySystemOptions::toImpl(isolate, value, impl, exceptionState);
-        return impl;
-    }
-};
-
 } // namespace blink
 
 #endif // NavigatorRequestMediaKeySystemAccess_h