Remove mojo::String.

mojo/public/cpp/bindings/struct_traits.h

 // Copyright 2015 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_STRUCT_TRAITS_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_STRUCT_TRAITS_H_
 
 namespace mojo {
 
 // This must be specialized for any type |T| to be serialized/deserialized as
@@ skipping 10 matching lines @@
 //        static <return type> <field name>(const T& input);
 //
 //      and should return a serializable form of the named field as extracted
 //      from |input|.
 //
 //      Serializable form of a field:
 //        Value or reference of the same type used in the generated stuct
 //        wrapper type, or the following alternatives:
 //        - string:
 //          Value or reference of any type that has a StringTraits defined.
-//          Supported by default: base::StringPiece, std::string, mojo::String,
+//          Supported by default: base::StringPiece, std::string,
 //          WTF::String (in blink).
 //
 //        - array:
 //          Value or reference of any type that has an ArrayTraits defined.
 //          Supported by default: std::vector, CArray, mojo::Array, WTF::Vector
 //          (in blink), mojo::WTFArray (in blink).
 //
 //        - map:
 //          Value or reference of any type that has a MapTraits defined.
 //          Supported by default: std::map, std::unordered_map,
@@ skipping 115 matching lines @@
 //
 //     static bool Read(FooDataView data, CustomFoo* output);
 //   };
 //
 template <typename DataViewType, typename T>
 struct StructTraits;
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_STRUCT_TRAITS_H_