Change the canonical way to include the C macros.h to <mojo/macros.h>.

mojo/public/cpp/bindings/lib/array_serialization.h

 // Copyright 2014 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.
 
 // TODO(vardhan):  Currently, the logic for serializing a mojom type exists in
 // two places: the C++ code generator template, and here.  However, most types
 // are serialized the same way within Arrays or outside, with the exception of
 // |bool|.  Consider defining serialization/deserialization traits for each
 // serializable type and call those traits from here.  This should help us
 // remove most of the ArraySerializer<> specializations here.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_
 
 #include <string.h>  // For |memcpy()|.
 #include <type_traits>
 #include <vector>
 
-#include "mojo/public/c/system/macros.h"
 #include "mojo/public/cpp/bindings/lib/array_internal.h"
 #include "mojo/public/cpp/bindings/lib/bindings_internal.h"
 #include "mojo/public/cpp/bindings/lib/iterator_util.h"
 #include "mojo/public/cpp/bindings/lib/map_data_internal.h"
 #include "mojo/public/cpp/bindings/lib/map_serialization_forward.h"
 #include "mojo/public/cpp/bindings/lib/string_serialization.h"
 #include "mojo/public/cpp/bindings/lib/validation_errors.h"
 
 namespace mojo {
 
@@ skipping 500 matching lines @@
   if (input) {
     internal::ArraySerializer<E, F>::DeserializeElements(input, output);
   } else {
     output->reset();
   }
 }
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_