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 aba3b6cca4f4df6d1cdc6e0079d7c74d8dc6deec..3e4fcf3093b9337accaedcad92c9c5768ed7d1fd 100644
--- a/ash/system/chromeos/power/tablet_power_button_controller.cc
+++ b/ash/system/chromeos/power/tablet_power_button_controller.cc
@@ -32,8 +32,7 @@ constexpr int kLockScreenTimeoutMs = 1000;
 // 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();