diff --git a/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer.cc b/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer.cc
index 62be42ba650194..277de19c6ab825 100644
--- a/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer.cc
+++ b/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer.cc
@@ -90,7 +90,7 @@ void ArcAppLaunchThrottleObserver::OnWillDestroyWatcher() {
 }
 
 void ArcAppLaunchThrottleObserver::OnLaunchedOrRequestExpired(
-    const std::string& name) {
+    const std::string name) {
   // This request has already expired or there are outstanding requests,
   // do not deactivate the observer.
   if (!current_requests_.erase(name) || current_requests_.size())
diff --git a/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer.h b/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer.h
index 7539e4f06571cb..965f3b0c3be019 100644
--- a/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer.h
+++ b/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer.h
@@ -59,7 +59,7 @@ class ArcAppLaunchThrottleObserver
   void OnWillDestroyWatcher() override;
 
  private:
-  void OnLaunchedOrRequestExpired(const std::string& name);
+  void OnLaunchedOrRequestExpired(const std::string name);
 
   std::set<std::string> current_requests_;
 
diff --git a/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer_unittest.cc b/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer_unittest.cc
index d8964c877fa3fe..071b716e066b52 100644
--- a/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer_unittest.cc
+++ b/chrome/browser/ash/arc/instance_throttle/arc_app_launch_throttle_observer_unittest.cc
@@ -148,5 +148,14 @@ TEST_F(ArcAppLaunchThrottleObserverTest, TestWindowWatcherEffectOnInit) {
   }
 }
 
+TEST_F(ArcAppLaunchThrottleObserverTest, TestCallbackString) {
+  auto temp_id = std::make_unique<std::string>("test_app_id");
+  observer()->OnArcAppLaunchRequested(*temp_id);
+  temp_id.reset();
+
+  // Expect no crash & memory leak.
+  environment()->FastForwardUntilNoTasksRemain();
+}
+
 }  // namespace
 }  // namespace arc