Convert utility process extension ParseUpdate IPC to mojo

extensions/test/test_content_utility_client.cc

Index: extensions/test/test_content_utility_client.cc
diff --git a/extensions/test/test_content_utility_client.cc b/extensions/test/test_content_utility_client.cc
index 56aee9fc627487bf6f2120727c18843408db228c..6166dab6d04a76eb437c77dfb2218542328cffe0 100644
--- a/extensions/test/test_content_utility_client.cc
+++ b/extensions/test/test_content_utility_client.cc
@@ -19,8 +19,4 @@ void TestContentUtilityClient::ExposeInterfacesToBrowser(
   UtilityHandler::ExposeInterfacesToBrowser(registry, false);
 }
 
-bool TestContentUtilityClient::OnMessageReceived(const IPC::Message& message) {
-  return utility_handler_.OnMessageReceived(message);
-}
-
 }  // namespace extensions