Remove unused V8 integration code in Sky

sky/engine/bindings/templates/dictionary_v8.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.
-
-// This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
-
-#ifndef {{v8_class}}_h
-#define {{v8_class}}_h
-
-{% for filename in header_includes %}
-#include "{{filename}}"
-{% endfor %}
-
-namespace blink {
-
-class {{v8_class}} {
-public:
-    static {{cpp_class}}* toNative(v8::Isolate*, v8::Handle<v8::Value>);
-};
-
-v8::Handle<v8::Value> toV8({{cpp_class}}*, v8::Handle<v8::Object>, v8::Isolate*);
-
-template<class CallbackInfo>
-inline void v8SetReturnValue(const CallbackInfo& callbackInfo, {{cpp_class}}* impl)
-{
-    v8SetReturnValue(callbackInfo, toV8(impl, callbackInfo.Holder(), callbackInfo.GetIsolate()));
-}
-
-} // namespace blink
-
-#endif // {{v8_class}}_h