chromeos: Promotes more from WmShell to Shell

ash/system/chromeos/power/tablet_power_button_controller_unittest.cc

Index: ash/system/chromeos/power/tablet_power_button_controller_unittest.cc
diff --git a/ash/system/chromeos/power/tablet_power_button_controller_unittest.cc b/ash/system/chromeos/power/tablet_power_button_controller_unittest.cc
index 8a2df301343d4768b12ed7e479d5dbeee0cf6829..3f06a501e28d74f6e0b6cb5b3f11c513e3ed9c0a 100644
--- a/ash/system/chromeos/power/tablet_power_button_controller_unittest.cc
+++ b/ash/system/chromeos/power/tablet_power_button_controller_unittest.cc
@@ -67,7 +67,7 @@ class TabletPowerButtonControllerTest : public AshTestBase {
     tablet_controller_->SetTickClockForTesting(
         std::unique_ptr<base::TickClock>(tick_clock_));
     shell_delegate_ =
-        static_cast<TestShellDelegate*>(WmShell::Get()->delegate());
+        static_cast<TestShellDelegate*>(Shell::Get()->shell_delegate());
     generator_ = &AshTestBase::GetEventGenerator();
     power_manager_client_->SendBrightnessChanged(kNonZeroBrightness, false);
     EXPECT_FALSE(GetBacklightsForcedOff());