Remove the ash-enable-touch-view-testing flag

ash/system/chromeos/power/tablet_power_button_controller.cc

Index: ash/system/chromeos/power/tablet_power_button_controller.cc
diff --git a/ash/system/chromeos/power/tablet_power_button_controller.cc b/ash/system/chromeos/power/tablet_power_button_controller.cc
index cb0a7f1ee73dae0eeeef87c518f228ae1740936b..fb5c1393b24ff10b0b80aaea7babd2c85a55871c 100644
--- a/ash/system/chromeos/power/tablet_power_button_controller.cc
+++ b/ash/system/chromeos/power/tablet_power_button_controller.cc
@@ -29,8 +29,7 @@ constexpr int kShutdownTimeoutMs = 500;
 // ignored.
 constexpr int kIgnorePowerButtonAfterResumeMs = 2000;
 
-// Returns true if device is a convertible/tablet device or has
-// kAshEnableTouchViewTesting in test, otherwise false.
+// Returns true if device is a convertible/tablet device, otherwise false.
 bool IsTabletModeSupported() {
   MaximizeModeController* maximize_mode_controller =
       WmShell::Get()->maximize_mode_controller();