PVS-Studio warning V599 for Angle

class Context
{
  ....
  ~Context();
  ....
  virtual void markContextLost();
  ....
};

void glDestroyContext(gl::Context *context)
{
  delete context;

  if (context == gl::getContext())
  {
    gl::makeCurrent(NULL, NULL, NULL);
  }
}

This suspicious code was found in Angle project by PVS-Studio static code analyzer.
Warning message is:
V599 The destructor was not declared as a virtual one, although the 'Context' class contains virtual functions. context.cpp 2955

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/