mash: Move //ash/session to //ash/common/session

ash/mus/bridge/wm_shell_mus.h

Index: ash/mus/bridge/wm_shell_mus.h
diff --git a/ash/mus/bridge/wm_shell_mus.h b/ash/mus/bridge/wm_shell_mus.h
index 641c9d084bf3c10386e6cb8781daa1f807f4e8d4..4615290a0887c0c2b70e3dffa53e2eb244c0a6c8 100644
--- a/ash/mus/bridge/wm_shell_mus.h
+++ b/ash/mus/bridge/wm_shell_mus.h
@@ -51,8 +51,6 @@ class WmShellMus : public WmShell, public ::mus::WindowTreeClientObserver {
   std::vector<WmWindow*> GetMruWindowList() override;
   std::vector<WmWindow*> GetMruWindowListIgnoreModals() override;
   bool IsForceMaximizeOnFirstRun() override;
-  bool IsUserSessionBlocked() override;
-  bool IsScreenLocked() override;
   bool CanShowWindowForUser(WmWindow* window) override;
   void LockCursor() override;
   void UnlockCursor() override;
@@ -63,6 +61,7 @@ class WmShellMus : public WmShell, public ::mus::WindowTreeClientObserver {
       wm::WindowState* window_state) override;
   bool IsOverviewModeSelecting() override;
   bool IsOverviewModeRestoringMinimizedWindows() override;
+  SessionStateDelegate* GetSessionStateDelegate() override;
   void AddActivationObserver(WmActivationObserver* observer) override;
   void RemoveActivationObserver(WmActivationObserver* observer) override;
   void AddDisplayObserver(WmDisplayObserver* observer) override;
@@ -85,6 +84,8 @@ class WmShellMus : public WmShell, public ::mus::WindowTreeClientObserver {
 
   std::vector<WmRootWindowControllerMus*> root_window_controllers_;
 
+  std::unique_ptr<SessionStateDelegate> session_state_delegate_;
+
   base::ObserverList<WmActivationObserver> activation_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WmShellMus);