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

remoting/host/chromoting_messages.cc

Index: remoting/host/chromoting_messages.cc
diff --git a/remoting/host/chromoting_messages.cc b/remoting/host/chromoting_messages.cc
index 36c3cf48fbb6d7e097647f7bcbec0bba66169791..174bebe6f73f82d030f6fbc6e765e9a0453a0ddd 100644
--- a/remoting/host/chromoting_messages.cc
+++ b/remoting/host/chromoting_messages.cc
@@ -14,6 +14,12 @@
 #include "ipc/struct_destructor_macros.h"
 #include "remoting/host/chromoting_messages.h"
 
+// Generate param traits size methods.
+#include "ipc/param_traits_size_macros.h"
+namespace IPC {
+#include "remoting/host/chromoting_messages.h"
+}
+
 // Generate param traits write methods.
 #include "ipc/param_traits_write_macros.h"
 namespace IPC {