Fix headers to account for the split of dart_api.h

Source/bindings/dart/DartNativeUtilities.h

 // Copyright 2012, 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 13 matching lines @@
 // 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 DartNativeUtilities_h
 #define DartNativeUtilities_h
 
 #include <dart_api.h>
+#include <dart_mirrors_api.h>
 
 namespace WebCore {
 
 Dart_NativeFunction commonHtmlResolver(Dart_Handle, int);
 Dart_NativeFunction domIsolateHtmlResolver(Dart_Handle, int);
 
 }
 
 #endif // DartNativeUtilities_h