ash: Use SessionController instead of SessionStateDelegate

ash/system/chromeos/power/video_activity_notifier.cc

Index: ash/system/chromeos/power/video_activity_notifier.cc
diff --git a/ash/system/chromeos/power/video_activity_notifier.cc b/ash/system/chromeos/power/video_activity_notifier.cc
index 283265a070924f0514be15256d479aaab50ca1e7..030e768461d0a5294fc16c728561092fa4c71af5 100644
--- a/ash/system/chromeos/power/video_activity_notifier.cc
+++ b/ash/system/chromeos/power/video_activity_notifier.cc
@@ -4,7 +4,7 @@
 
 #include "ash/system/chromeos/power/video_activity_notifier.h"
 
-#include "ash/common/session/session_state_delegate.h"
+#include "ash/common/session/session_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
@@ -24,7 +24,7 @@ VideoActivityNotifier::VideoActivityNotifier(VideoDetector* detector)
     : detector_(detector),
       video_state_(detector->state()),
       screen_is_locked_(
-          Shell::GetInstance()->session_state_delegate()->IsScreenLocked()) {
+          WmShell::Get()->session_controller()->IsScreenLocked()) {
   detector_->AddObserver(this);
   Shell::GetInstance()->AddShellObserver(this);