Switch to dartgenerator.py for C++ callbacks generation.

Source/WebCore/bindings/dart/custom/DartWebKitMutationObserverCustom.cpp

 // Copyright 2011, 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.
 
 #include "config.h"
+
+#if ENABLE(MUTATION_OBSERVERS)
 #include "DartWebKitMutationObserver.h"
+#endif
 
 #if ENABLE(MUTATION_OBSERVERS)
 
 namespace WebCore {
 
 namespace DartWebKitMutationObserverInternal {
 
 void observeCallback(Dart_NativeArguments)
 {
     // FIXME: proper implementation.
     DART_UNIMPLEMENTED();
 }
 
 }
 
 }
 
 #endif // ENABLE(MUTATION_OBSERVERS)