Fix sky include guards to match Chromium style

sky/engine/bindings/templates/interface.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
+#ifndef SKY_ENGINE_BINDINGS_TEMPLATES_INTERFACE_H_
+#define SKY_ENGINE_BINDINGS_TEMPLATES_INTERFACE_H_
 
 {% filter conditional(conditional_string) %}
 {% for filename in header_includes %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
 
 {% if has_event_constructor %}
 class Dictionary;
@@ skipping 254 matching lines @@
 {
     v8SetReturnValueFast(callbackInfo, impl.get(), wrappable);
 }
 
 {% if has_event_constructor %}
 bool initialize{{cpp_class}}({{cpp_class}}Init&, const Dictionary&, ExceptionState&, const v8::FunctionCallbackInfo<v8::Value>& info, const String& = "");
 
 {% endif %}
 } // namespace blink
 {% endfilter %}
-#endif // {{v8_class}}_h
+#endif  // SKY_ENGINE_BINDINGS_TEMPLATES_INTERFACE_H_