void* operator new(size_t sz, nsIPresContext* aContext) { void* result = nsnull; aContext->AllocateFromShell(sz, &result); return result; }
nsStyleFont::operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW { void* result = aContext->AllocateFromShell(sz); if (result) memset(result, 0, sz); return result; }
  void* operator new(size_t sz, nsIPresContext* aContext) {    void* result = nsnull;    aContext->AllocateFromShell(sz, &result);    return result;  }