Fix sky include guards to match Chromium style

sky/engine/bindings/core/v8/CustomElementBinding.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef CustomElementBinding_h
-#define CustomElementBinding_h
+#ifndef SKY_ENGINE_BINDINGS_CORE_V8_CUSTOMELEMENTBINDING_H_
+#define SKY_ENGINE_BINDINGS_CORE_V8_CUSTOMELEMENTBINDING_H_
 
 #include "sky/engine/bindings/core/v8/ScopedPersistent.h"
 #include "sky/engine/wtf/PassOwnPtr.h"
 #include "v8/include/v8.h"
 
 namespace blink {
 
 struct WrapperTypeInfo;
 
 class CustomElementBinding {
 public:
     static PassOwnPtr<CustomElementBinding> create(v8::Isolate*, v8::Handle<v8::Object> prototype, const WrapperTypeInfo*);
 
     ~CustomElementBinding() { }
 
     v8::Handle<v8::Object> prototype() { return m_prototype.newLocal(m_isolate); }
     const WrapperTypeInfo* wrapperType() { return m_wrapperType; }
 
 private:
     CustomElementBinding(v8::Isolate*, v8::Handle<v8::Object> prototype, const WrapperTypeInfo*);
 
     v8::Isolate* m_isolate;
     ScopedPersistent<v8::Object> m_prototype;
     const WrapperTypeInfo* m_wrapperType;
 };
 
 }
 
-#endif // CustomElementBinding_h
+#endif  // SKY_ENGINE_BINDINGS_CORE_V8_CUSTOMELEMENTBINDING_H_