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

chrome/common/importer/profile_import_process_messages.cc

Index: chrome/common/importer/profile_import_process_messages.cc
diff --git a/chrome/common/importer/profile_import_process_messages.cc b/chrome/common/importer/profile_import_process_messages.cc
index 4a0b9a4d46d054d82cad685873cfb7ac538360a0..b585c24fadd98d6ade8bb87ebccbc56a13b80d71 100644
--- a/chrome/common/importer/profile_import_process_messages.cc
+++ b/chrome/common/importer/profile_import_process_messages.cc
@@ -14,6 +14,12 @@
 #include "ipc/struct_destructor_macros.h"
 #include "chrome/common/importer/profile_import_process_messages.h"
 
+// Generate param traits size methods.
+#include "ipc/param_traits_size_macros.h"
+namespace IPC {
+#include "chrome/common/importer/profile_import_process_messages.h"
+}
+
 // Generate param traits write methods.
 #include "ipc/param_traits_write_macros.h"
 namespace IPC {