Removing file_thread_task_runner parameter from SerialIoHandler

tools/battor_agent/battor_agent_unittest.cc

Index: tools/battor_agent/battor_agent_unittest.cc
diff --git a/tools/battor_agent/battor_agent_unittest.cc b/tools/battor_agent/battor_agent_unittest.cc
index 1bb9a9f5047b7b0e3ad673427054177dacda2ceb..d5f882b1fd7f64351c17932eec4bbaf87d17c15a 100644
--- a/tools/battor_agent/battor_agent_unittest.cc
+++ b/tools/battor_agent/battor_agent_unittest.cc
@@ -82,7 +82,7 @@ class MockBattOrConnection : public BattOrConnection {
 class TestableBattOrAgent : public BattOrAgent {
  public:
   TestableBattOrAgent(BattOrAgent::Listener* listener)
-      : BattOrAgent("/dev/test", listener, nullptr, nullptr) {
+      : BattOrAgent("/dev/test", listener, nullptr) {
     connection_ =
         std::unique_ptr<BattOrConnection>(new MockBattOrConnection(this));
   }