Remove explicit singletonness of ArcBridgeService part 4.

chrome/browser/chromeos/arc/arc_session_manager.cc

Index: chrome/browser/chromeos/arc/arc_session_manager.cc
diff --git a/chrome/browser/chromeos/arc/arc_session_manager.cc b/chrome/browser/chromeos/arc/arc_session_manager.cc
index 31595541115c22fa6f4ec32dd325f565805f6fdf..806efa3cdc44ff301d63255015bb7135be3d5d50 100644
--- a/chrome/browser/chromeos/arc/arc_session_manager.cc
+++ b/chrome/browser/chromeos/arc/arc_session_manager.cc
@@ -81,7 +81,9 @@ ash::ShelfDelegate* GetShelfDelegate() {
 }  // namespace
 
 ArcSessionManager::ArcSessionManager(ArcBridgeService* bridge_service)
-    : ArcService(bridge_service), weak_ptr_factory_(this) {
+    : ArcService(bridge_service),
+      attempt_user_exit_callback_(base::Bind(chrome::AttemptUserExit)),
+      weak_ptr_factory_(this) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(!g_arc_session_manager);
   g_arc_session_manager = this;
@@ -253,7 +255,7 @@ void ArcSessionManager::OnProvisioningFinished(ProvisioningResult result) {
       VLOG(1) << "Robot account auth code fetching error";
       // Log out the user. All the cleanup will be done in Shutdown() method.
       // The callback is not called because auth code is empty.
-      chrome::AttemptUserExit();
+      attempt_user_exit_callback_.Run();
       return;
     }
 
@@ -838,6 +840,12 @@ void ArcSessionManager::OnSendFeedbackClicked() {
   chrome::OpenFeedbackDialog(nullptr);
 }
 
+void ArcSessionManager::SetAttemptUserExitCallbackForTesting(
+    const base::Closure& callback) {
+  DCHECK(!callback.is_null());
+  attempt_user_exit_callback_ = callback;
+}
+
 std::ostream& operator<<(std::ostream& os,
                          const ArcSessionManager::State& state) {
   switch (state) {