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

extensions/common/permissions/manifest_permission.h

Index: extensions/common/permissions/manifest_permission.h
diff --git a/extensions/common/permissions/manifest_permission.h b/extensions/common/permissions/manifest_permission.h
index 98e4c2306c3f00e4448bd086704bb1c1318bf6b7..aa05d5fbdee2cdb3c6121c4730fba396e0e2d789 100644
--- a/extensions/common/permissions/manifest_permission.h
+++ b/extensions/common/permissions/manifest_permission.h
@@ -68,6 +68,9 @@ class ManifestPermission {
   bool Equal(const ManifestPermission* rhs) const;
 
   // IPC functions
+  // Gets the size of the data to be written.
+  void GetSize(base::PickleSizer* s) const;
+
   // Writes this into the given IPC message |m|.
   void Write(base::Pickle* m) const;