Generate param traits size methods for IPC files in chrome/ (and traits it depends on).

components/network_hints/common/network_hints_message_generator.cc

Index: components/network_hints/common/network_hints_message_generator.cc
diff --git a/components/network_hints/common/network_hints_message_generator.cc b/components/network_hints/common/network_hints_message_generator.cc
index f315e98440c7a597a57a9975218ba11ae5b202e4..594871af60630fc723f12833755e128098770316 100644
--- a/components/network_hints/common/network_hints_message_generator.cc
+++ b/components/network_hints/common/network_hints_message_generator.cc
@@ -14,6 +14,12 @@
 #include "ipc/struct_destructor_macros.h"
 #include "components/network_hints/common/network_hints_message_generator.h"
 
+// Generate param traits size methods.
+#include "ipc/param_traits_size_macros.h"
+namespace IPC {
+#include "components/network_hints/common/network_hints_message_generator.h"
+}  // namespace IPC
+
 // Generate param traits write methods.
 #include "ipc/param_traits_write_macros.h"
 namespace IPC {