Rename mojo::TokenSerializer to mojo::Broker.

mojo/edk/system/BUILD.gn

Index: mojo/edk/system/BUILD.gn
diff --git a/mojo/edk/system/BUILD.gn b/mojo/edk/system/BUILD.gn
index 7b25702b0de2159c6f8aa83df70141051fd81003..038d753f17ab18974cdddecb219a75550db3b386 100644
--- a/mojo/edk/system/BUILD.gn
+++ b/mojo/edk/system/BUILD.gn
@@ -31,8 +31,14 @@ static_library("system") {
     "awakable.h",
     "awakable_list.cc",
     "awakable_list.h",
-    "child_token_serializer_win.cc",
-    "child_token_serializer_win.h",
+    "broker.h",
+    "broker_messages.h",
+    "broker_state.cc",
+    "broker_state.h",
+    "child_broker.cc",
+    "child_broker.h",
+    "child_broker_host.cc",
+    "child_broker_host.h",
     "configuration.cc",
     "configuration.h",
     "core.cc",
@@ -57,10 +63,6 @@ static_library("system") {
     "message_pipe_dispatcher.cc",
     "message_pipe_dispatcher.h",
     "options_validation.h",
-    "parent_token_serializer_state_win.cc",
-    "parent_token_serializer_state_win.h",
-    "parent_token_serializer_win.cc",
-    "parent_token_serializer_win.h",
     "platform_handle_dispatcher.cc",
     "platform_handle_dispatcher.h",
     "raw_channel.cc",
@@ -69,12 +71,10 @@ static_library("system") {
     "raw_channel_win.cc",
     "shared_buffer_dispatcher.cc",
     "shared_buffer_dispatcher.h",
+    "simple_broker.cc",
+    "simple_broker.h",
     "simple_dispatcher.cc",
     "simple_dispatcher.h",
-    "simple_token_serializer_win.cc",
-    "simple_token_serializer_win.h",
-    "token_serializer_messages_win.h",
-    "token_serializer_win.h",
     "transport_data.cc",
     "transport_data.h",
     "waiter.cc",