chromeos: Remove old LockScreen signal.

chrome/browser/chromeos/login/screen_locker.cc

Index: chrome/browser/chromeos/login/screen_locker.cc
diff --git a/chrome/browser/chromeos/login/screen_locker.cc b/chrome/browser/chromeos/login/screen_locker.cc
index 3915714005adf4db441a951e54e8e90d9b940fa1..89b449408b74126f36d840a3e28e770a9ae46f4b 100644
--- a/chrome/browser/chromeos/login/screen_locker.cc
+++ b/chrome/browser/chromeos/login/screen_locker.cc
@@ -107,16 +107,9 @@ class ScreenLockObserver : public SessionManagerClient::Observer,
     }
   }
 
-  // TODO(derat): Remove this once the session manager is calling the LockScreen
-  // method instead of emitting a signal.
-  virtual void LockScreen() OVERRIDE {
-    VLOG(1) << "Received LockScreen D-Bus signal from session manager";
-    ScreenLocker::HandleLockScreenRequest();
-  }
-
   virtual void OnUserAddingFinished() OVERRIDE {
     UserAddingScreen::Get()->RemoveObserver(this);
-    LockScreen();
+    ScreenLocker::HandleLockScreenRequest();
   }
 
  private: