Revert of Tablet-like power button behavior on Convertible/Tablet ChromeOS devices

ash/wm/lock_state_controller.h

Index: ash/wm/lock_state_controller.h
diff --git a/ash/wm/lock_state_controller.h b/ash/wm/lock_state_controller.h
index cbccac736f65ac8cbb408826c0836bc02d20cf74..388558db4ab0302dbb62eb3bdf9ab4a5cbe6cf2c 100644
--- a/ash/wm/lock_state_controller.h
+++ b/ash/wm/lock_state_controller.h
@@ -39,6 +39,7 @@
 namespace test {
 class LockStateControllerTest;
 class LockStateControllerTestApi;
+class PowerButtonControllerTest;
 }
 
 // Displays onscreen animations and locks or suspends the system in response to
@@ -153,6 +154,7 @@
   }
 
  private:
+  friend class test::PowerButtonControllerTest;
   friend class test::LockStateControllerTest;
   friend class test::LockStateControllerTestApi;