Convert serialized values to ints if they are whole and less than 53 bits.

Source/bindings/dart/DartUtilities.h

 // 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 346 matching lines @@
         if (Dart_IsError(result)) {
             exception = Dart_NewStringFromCString(Dart_GetError(result));
             return 0;
         }
         if (value < INT_MIN || value > INT_MAX) {
             exception = Dart_NewStringFromCString("value out of range");
             return 0;
         }
         return value;
     }
-    static Dart_Handle intToDart(int value)
+    static Dart_Handle intToDart(int64_t value)
     {
         return Dart_NewInteger(value);
     }
 
     static unsigned dartToUnsigned(Dart_Handle, Dart_Handle& exception);
     static unsigned dartToUnsigned(Dart_NativeArguments args, int index, Dart_Handle& exception)
     {
         int64_t value;
         Dart_Handle result = Dart_GetNativeIntegerArgument(args, index, &value);
         if (Dart_IsError(result)) {
@@ skipping 256 matching lines @@
     }
 };
 
 
 #define DART_UNIMPLEMENTED_EXCEPTION() DartUtilities::notImplementedException(__FILE__, __LINE__)
 #define DART_UNIMPLEMENTED() Dart_ThrowException(DART_UNIMPLEMENTED_EXCEPTION());
 
 } // namespace WebCore
 
 #endif // DartUtilities_h