VM: Const-correctness fixes.

runtime/bin/dartutils.cc

 // 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.
 
 #include "bin/dartutils.h"
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
 #include "include/dart_native_api.h"
 
@@ skipping 590 matching lines @@
         Dart_Handle library = Dart_LookupLibrary(library_uri);
         if (Dart_IsError(library)) {
           Dart_PropagateError(library);
         }
         result = Dart_LoadSource(library, resolved_script_uri, source, 0, 0);
       }
     }
   }
 
   if (buffer_copy != NULL) {
-    free(const_cast<uint8_t *>(buffer_copy));
+    free(buffer_copy);
   }
 
   if (Dart_IsError(result)) {
     Dart_PropagateError(result);
   }
 }
 
 
 // Callback function that gets called from dartutils when there are
 // no more outstanding load requests.
@@ skipping 671 matching lines @@
       new CObjectString(CObject::NewString(os_error->message()));
   CObjectArray* result = new CObjectArray(CObject::NewArray(3));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kOSError)));
   result->SetAt(1, new CObjectInt32(CObject::NewInt32(os_error->code())));
   result->SetAt(2, error_message);
   return result;
 }
 
 }  // namespace bin
 }  // namespace dart