Move FieldTrialRecorder mojom to content

content/public/test/mock_render_thread.cc

Index: content/public/test/mock_render_thread.cc
diff --git a/content/public/test/mock_render_thread.cc b/content/public/test/mock_render_thread.cc
index 2ab1d2ae384d57dd7af01ed930f9f798eea09911..8021b1559488d3d8d7d667f4bf45b9bd640ef77f 100644
--- a/content/public/test/mock_render_thread.cc
+++ b/content/public/test/mock_render_thread.cc
@@ -291,6 +291,8 @@ service_manager::InterfaceProvider* MockRenderThread::GetRemoteInterfaces() {
   return remote_interfaces_.get();
 }
 
+void MockRenderThread::SetFieldTrialGroup(const std::string& trial_name,
+                                          const std::string& group_name) {}
 void MockRenderThread::SendCloseMessage() {
   ViewMsg_Close msg(routing_id_);
   RenderViewImpl::FromRoutingID(routing_id_)->OnMessageReceived(msg);