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

chrome/common/render_messages.cc

Index: chrome/common/render_messages.cc
diff --git a/chrome/common/render_messages.cc b/chrome/common/render_messages.cc
index d108f42e596f6d050f4a6d627221f41bfa807398..1b419240127a482eb9d9e9644167c581fbd2e2e4 100644
--- a/chrome/common/render_messages.cc
+++ b/chrome/common/render_messages.cc
@@ -8,6 +8,12 @@
 
 namespace IPC {
 
+void ParamTraits<ContentSettingsPattern>::GetSize(
+    base::PickleSizer* s,
+    const ContentSettingsPattern& pattern) {
+  ContentSettingsPatternSerializer::GetSize(pattern, s);
+}
+
 void ParamTraits<ContentSettingsPattern>::Write(
     base::Pickle* m,
     const ContentSettingsPattern& pattern) {