Add ash SessionStateDelegate

ash/wm/workspace/workspace_cycler.cc

Index: ash/wm/workspace/workspace_cycler.cc
diff --git a/ash/wm/workspace/workspace_cycler.cc b/ash/wm/workspace/workspace_cycler.cc
index 67319937b6c089718e10cf2bf1488e173ba60d14..9d4cda1b50e6f945b3496fe8b69323534f60a6c1 100644
--- a/ash/wm/workspace/workspace_cycler.cc
+++ b/ash/wm/workspace/workspace_cycler.cc
@@ -6,6 +6,7 @@
 
 #include <cmath>
 
+#include "ash/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/wm/workspace/workspace_cycler_configuration.h"
 #include "ash/wm/workspace/workspace_manager.h"
@@ -22,7 +23,7 @@ namespace {
 // Returns true if cycling is allowed.
 bool IsCyclingAllowed() {
   // Cycling is disabled if the screen is locked or a modal dialog is open.
-  return !Shell::GetInstance()->IsScreenLocked() &&
+  return !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
          !Shell::GetInstance()->IsSystemModalWindowOpen();
 }