cros: Use SessionController for lock starting code

chrome/browser/ui/ash/session_controller_client.cc

Index: chrome/browser/ui/ash/session_controller_client.cc
diff --git a/chrome/browser/ui/ash/session_controller_client.cc b/chrome/browser/ui/ash/session_controller_client.cc
index 3325fa213e367006142554700293d633b30583cf..693ad99d7eb2ba529957e2d79a080588b3f3b4f7 100644
--- a/chrome/browser/ui/ash/session_controller_client.cc
+++ b/chrome/browser/ui/ash/session_controller_client.cc
@@ -118,6 +118,10 @@ SessionControllerClient* SessionControllerClient::Get() {
   return g_instance;
 }
 
+void SessionControllerClient::StartLock(StartLockCallback callback) {
+  session_controller_->StartLock(callback);
+}
+
 void SessionControllerClient::RunUnlockAnimation(
     base::Closure animation_finished_callback) {
   session_controller_->RunUnlockAnimation(animation_finished_callback);