cros: Use runtime stylus detection for ash palette.

chrome/browser/ui/ash/palette_delegate_chromeos.cc

Index: chrome/browser/ui/ash/palette_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/palette_delegate_chromeos.cc b/chrome/browser/ui/ash/palette_delegate_chromeos.cc
index 7c923d6f3d1b574124cb2fa4406768d080155591..cc6db0d86cbcae37adf71c554c29ba8b4798de83 100644
--- a/chrome/browser/ui/ash/palette_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/palette_delegate_chromeos.cc
@@ -21,29 +21,17 @@
 #include "components/user_manager/user_manager.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
-#include "ui/events/devices/input_device_manager.h"
 
 namespace chromeos {
 
-// static
-std::unique_ptr<PaletteDelegateChromeOS> PaletteDelegateChromeOS::Create() {
-  if (!ash::IsPaletteFeatureEnabled())
-    return nullptr;
-  return base::WrapUnique(new PaletteDelegateChromeOS());
-}
-
 PaletteDelegateChromeOS::PaletteDelegateChromeOS() : weak_factory_(this) {
   registrar_.Add(this, chrome::NOTIFICATION_SESSION_STARTED,
                  content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_PROFILE_DESTROYED,
                  content::NotificationService::AllSources());
-
-  ui::InputDeviceManager::GetInstance()->AddObserver(this);
 }
 
-PaletteDelegateChromeOS::~PaletteDelegateChromeOS() {
-  ui::InputDeviceManager::GetInstance()->RemoveObserver(this);
-}
+PaletteDelegateChromeOS::~PaletteDelegateChromeOS() {}
 
 std::unique_ptr<PaletteDelegateChromeOS::EnableListenerSubscription>
 PaletteDelegateChromeOS::AddPaletteEnableListener(
@@ -131,11 +119,6 @@ void PaletteDelegateChromeOS::OnPartialScreenshotDone(
     then.Run();
 }
 
-void PaletteDelegateChromeOS::SetStylusStateChangedCallback(
-    const OnStylusStateChangedCallback& on_stylus_state_changed) {
-  on_stylus_state_changed_ = on_stylus_state_changed;
-}
-
 bool PaletteDelegateChromeOS::ShouldAutoOpenPalette() {
   if (!profile_)
     return false;
@@ -176,7 +159,4 @@ void PaletteDelegateChromeOS::CancelPartialScreenshot() {
   ash::Shell::GetInstance()->screenshot_controller()->CancelScreenshotSession();
 }
 
-void PaletteDelegateChromeOS::OnStylusStateChanged(ui::StylusState state) {
-  on_stylus_state_changed_.Run(state);
-}
 }  // namespace chromeos