Replace //net TypeConverters with StructTraits.

mojo/public/cpp/bindings/BUILD.gn

 # 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.
 
 source_set("bindings") {
   sources = [
     "array.h",
     "array_traits.h",
     "array_traits_carray.h",
     "array_traits_standard.h",
     "array_traits_stl.h",
     "associated_binding.h",
     "associated_group.h",
     "associated_interface_ptr.h",
     "associated_interface_ptr_info.h",
     "associated_interface_request.h",
     "binding.h",
     "binding_set.h",
-    "enum_traits.h",
     "interface_ptr.h",
     "interface_ptr_info.h",
     "interface_ptr_set.h",
     "interface_request.h",
     "lib/array_internal.cc",
     "lib/array_internal.h",
     "lib/array_serialization.h",
     "lib/associated_group.cc",
     "lib/associated_interface_ptr_state.h",
     "lib/binding_state.h",
@@ skipping 96 matching lines @@
   ]
 
   deps = [
     "//base",
     "//mojo/public/interfaces/bindings:bindings_cpp_sources",
   ]
 }
 
 source_set("struct_traits") {
   sources = [
+    "enum_traits.h",
     "struct_traits.h",
   ]
 }
 
 if (!is_ios) {
   # TODO(yzshen): crbug.com/617718 Consider moving this into blink.
   source_set("wtf_support") {
     sources = [
       "array_traits_wtf.h",
       "array_traits_wtf_vector.h",
       "lib/string_traits_wtf.cc",
       "lib/wtf_serialization.h",
       "map_traits_wtf.h",
       "string_traits_wtf.h",
       "wtf_array.h",
       "wtf_map.h",
     ]
 
     public_deps = [
       ":bindings",
       "//third_party/WebKit/Source/wtf",
     ]
 
     public_configs = [ "//third_party/WebKit/Source:config" ]
   }
 }