Fix issue 13942 - Dart_Error function invokes OS::VSNPrint with the "format" string containing data…

runtime/bin/dartutils.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef BIN_DARTUTILS_H_
 #define BIN_DARTUTILS_H_
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 
@@ skipping 143 matching lines @@
                                         Dart_Handle os_error);
 
   // Create a new Dart String object from a C String.
   static Dart_Handle NewString(const char* str) {
     ASSERT(str != NULL);
     return Dart_NewStringFromUTF8(reinterpret_cast<const uint8_t*>(str),
                                   strlen(str));
   }
 
   // Create a new Dart InternalError object with the provided message.
+  static Dart_Handle NewError(const char* format, ...);
   static Dart_Handle NewInternalError(const char* message);
 
   static bool SetOriginalWorkingDirectory();
 
   static const char* MapLibraryUrl(CommandLineOptions* url_mapping,
                                    const char* url_string);
 
   static Dart_Handle SetWorkingDirectory(Dart_Handle builtin_lib);
 
   static Dart_Handle ResolveScriptUri(Dart_Handle script_uri,
@@ skipping 344 matching lines @@
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CObjectExternalUint8Array);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_DARTUTILS_H_