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..983399856ff3f62f34c7c83e382ac8307dc3690d 100644
--- a/ash/system/chromeos/power/tablet_power_button_controller_unittest.cc
+++ b/ash/system/chromeos/power/tablet_power_button_controller_unittest.cc
@@ -66,8 +66,7 @@ class TabletPowerButtonControllerTest : public AshTestBase {
     tick_clock_ = new base::SimpleTestTickClock;
     tablet_controller_->SetTickClockForTesting(
         std::unique_ptr<base::TickClock>(tick_clock_));
-    shell_delegate_ =
-        static_cast<TestShellDelegate*>(WmShell::Get()->delegate());
+    shell_delegate_ = static_cast<TestShellDelegate*>(Shell::Get()->delegate());
     generator_ = &AshTestBase::GetEventGenerator();
     power_manager_client_->SendBrightnessChanged(kNonZeroBrightness, false);
     EXPECT_FALSE(GetBacklightsForcedOff());