message: Fix windows build for r363357
  MSVC has trouble referencing the protected Compare class from from the
  friend Entry operator<. Just delete that operator, as it's used only
  once.
diff: @@ -28,10 +28,6 @@ public:
  struct Entry {
  Entry(ConstString cstr, const T &v) : cstring(cstr), value(v) {}
  - friend bool operator<(const Entry &lhs, const Entry &rhs) {
  - return Compare()(lhs, rhs);
  - }
  -
  ConstString cstring;
  T value;
  };
  @@ -165,7 +161,7 @@ public:
  // my_map.Append (UniqueCStringMap::Entry(GetName(...), GetValue(...)));
  // }
  // my_map.Sort();
  - void Sort() { llvm::sort(m_map.begin(), m_map.end()); }
  + void Sort() { llvm::sort(m_map.begin(), m_map.end(), Compare()); }
  // Since we are using a vector to contain our items it will always double its
  // memory consumption as things are added to the vector, so if you intend to
  