Mojo C++ bindings: switch the remaining callsites of the old serialization interface.

mojo/public/cpp/bindings/BUILD.gn

Index: mojo/public/cpp/bindings/BUILD.gn
diff --git a/mojo/public/cpp/bindings/BUILD.gn b/mojo/public/cpp/bindings/BUILD.gn
index 4579b98fd7878daa09ec06df0a3fb80368cf75c1..d099faf5e42539a1c573743603cdaa14ca0f8652 100644
--- a/mojo/public/cpp/bindings/BUILD.gn
+++ b/mojo/public/cpp/bindings/BUILD.gn
@@ -73,10 +73,11 @@ source_set("bindings") {
     "lib/scoped_interface_endpoint_handle.cc",
     "lib/scoped_interface_endpoint_handle.h",
     "lib/serialization.h",
+    "lib/serialization_context.cc",
+    "lib/serialization_context.h",
     "lib/serialization_forward.h",
     "lib/serialization_util.cc",
     "lib/serialization_util.h",
-    "lib/string_serialization.cc",
     "lib/string_serialization.h",
     "lib/sync_handle_registry.cc",
     "lib/sync_handle_registry.h",
@@ -89,10 +90,6 @@ source_set("bindings") {
     "lib/validation_util.cc",
     "lib/validation_util.h",
     "lib/value_traits.h",
-
-    # Include the .h but not the .cc file. The .h file is used by
-    # serialization_forward.h.
-    "lib/wtf_string_serialization.h",
     "map.h",
     "message.h",
     "message_filter.h",
@@ -148,8 +145,6 @@ source_set("wtf_support") {
     "lib/array_traits_wtf.h",
     "lib/string_traits_wtf.cc",
     "lib/wtf_serialization.h",
-    "lib/wtf_string_serialization.cc",
-    "lib/wtf_string_serialization.h",
     "string_traits_wtf.h",
     "wtf_array.h",
   ]