Fix sky include guards to match Chromium style

sky/engine/bindings/templates/dictionary_impl.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 {{cpp_class}}_h
-#define {{cpp_class}}_h
+#ifndef SKY_ENGINE_BINDINGS_TEMPLATES_DICTIONARY_IMPL_H_
+#define SKY_ENGINE_BINDINGS_TEMPLATES_DICTIONARY_IMPL_H_
 
 {% for filename in header_includes %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
 
 class {{cpp_class}} final {
 public:
     static {{cpp_class}}* create()
@@ skipping 12 matching lines @@
 
     {% for member in members %}
     {{member.member_cpp_type}} m_{{member.name}};
     {% endfor %}
 
     friend class V8{{cpp_class}};
 };
 
 } // namespace blink
 
-#endif // {{cpp_class}}_h
+#endif  // SKY_ENGINE_BINDINGS_TEMPLATES_DICTIONARY_IMPL_H_