ash: Restore previous show state after exiting fullscreen.

ash/mus/top_level_window_factory_unittest.cc

Index: ash/mus/top_level_window_factory_unittest.cc
diff --git a/ash/mus/top_level_window_factory_unittest.cc b/ash/mus/top_level_window_factory_unittest.cc
index 65c44d461068e89fe4eef0ab4c7fa0d2687fa4ec..61a5a21b8cb71064fe17edc61472052fc0d49083 100644
--- a/ash/mus/top_level_window_factory_unittest.cc
+++ b/ash/mus/top_level_window_factory_unittest.cc
@@ -24,7 +24,7 @@ using TopLevelWindowFactoryTest = AshTest;
 TEST_F(TopLevelWindowFactoryTest, CreateFullscreenWindow) {
   std::unique_ptr<WindowOwner> window_owner = CreateToplevelTestWindow();
   WmWindow* window = window_owner->window();
-  window->SetFullscreen();
+  window->SetFullscreen(true);
   WmWindow* root_window = WmShell::Get()->GetPrimaryRootWindow();
   EXPECT_EQ(root_window->GetBounds(), window->GetBounds());
 }