Converts most of WorkspaceLayoutManager tests to use common code

ash/test/ash_test_base.cc

Index: ash/test/ash_test_base.cc
diff --git a/ash/test/ash_test_base.cc b/ash/test/ash_test_base.cc
index bee7d9c8e3b69694131ddd31dfe9b749ee72fa06..ac53f6e1aa1a4efe289ed1df9df2ec16c7dc9902 100644
--- a/ash/test/ash_test_base.cc
+++ b/ash/test/ash_test_base.cc
@@ -327,11 +327,6 @@ void AshTestBase::SetUserLoggedIn(bool user_logged_in) {
       user_logged_in);
 }
 
-void AshTestBase::SetCanLockScreen(bool can_lock_screen) {
-  AshTestHelper::GetTestSessionStateDelegate()->SetCanLockScreen(
-      can_lock_screen);
-}
-
 void AshTestBase::SetShouldLockScreenBeforeSuspending(bool should_lock) {
   AshTestHelper::GetTestSessionStateDelegate()
       ->SetShouldLockScreenBeforeSuspending(should_lock);