Ok, here is a different approach at this change.

chrome/common/child_process_logging_mac.mm

Index: chrome/common/child_process_logging_mac.mm
diff --git a/chrome/common/child_process_logging_mac.mm b/chrome/common/child_process_logging_mac.mm
index 9e89c014e8d2227b414ef735362a76f1c8f6b241..8ed617d83e4c70efef750a9772ff7dedf4007903 100644
--- a/chrome/common/child_process_logging_mac.mm
+++ b/chrome/common/child_process_logging_mac.mm
@@ -91,4 +91,9 @@ void SetClientId(const std::string& client_id) {
   std::wstring wstr = ASCIIToWide(str);
   GoogleUpdateSettings::SetMetricsId(wstr);
 }
+
+void SetActiveExtensions(const std::vector<std::string> extension_ids) {
+  // TODO(port)
+}
+
 }  // namespace child_process_logging