chromeos: Tie tablet power button to --enable-touchview.

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 6675c9f4065713fd0249e5e6e926c8456ab83a06..812c9993ddde6b569142070399dbdf6f2f8ea11f 100644
--- a/ash/system/chromeos/power/tablet_power_button_controller_unittest.cc
+++ b/ash/system/chromeos/power/tablet_power_button_controller_unittest.cc
@@ -52,8 +52,6 @@ class TabletPowerButtonControllerTest : public AshTestBase {
     dbus_setter->SetPowerManagerClient(base::WrapUnique(power_manager_client_));
     base::CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kAshEnableTouchViewTesting);
-    base::CommandLine::ForCurrentProcess()->AppendSwitch(
-        switches::kAshEnableTabletPowerButton);
     AshTestBase::SetUp();
 
     lock_state_controller_ = Shell::GetInstance()->lock_state_controller();