Mojo C++ bindings: add StringTraits and ArrayTraits for STL types.

mojo/public/cpp/bindings/array_traits_standard.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_TRAITS_STANDARD_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_TRAITS_STANDARD_H_
+#ifndef MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_STANDARD_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_STANDARD_H_
 
 #include "mojo/public/cpp/bindings/array.h"
 #include "mojo/public/cpp/bindings/array_traits.h"
 
 namespace mojo {
 
 template <typename T>
 struct ArrayTraits<Array<T>> {
   using Element = T;
 
@@ skipping 13 matching lines @@
   static typename Array<T>::ConstRefType& GetAt(const Array<T>& input,
                                                 size_t index) {
     return input[index];
   }
 
   static void Resize(Array<T>& input, size_t size) { input.resize(size); }
 };
 
 }  // namespace mojo
 
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_TRAITS_STANDARD_H_
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_STANDARD_H_