cros: Use runtime stylus detection for ash palette.

chrome/browser/ui/ash/palette_delegate_chromeos.h

Index: chrome/browser/ui/ash/palette_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/palette_delegate_chromeos.h b/chrome/browser/ui/ash/palette_delegate_chromeos.h
index 95acad8949a5d07ffe99b23e43c48c64d0a51271..07bed63f77cf8e47555bba67812d126abf68cca8 100644
--- a/chrome/browser/ui/ash/palette_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/palette_delegate_chromeos.h
@@ -15,7 +15,6 @@
 #include "base/values.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
-#include "ui/events/devices/input_device_event_observer.h"
 
 class PrefChangeRegistrar;
 class Profile;
@@ -28,26 +27,18 @@ namespace chromeos {
 
 // A class which allows the Ash palette to perform chrome actions.
 class PaletteDelegateChromeOS : public ash::PaletteDelegate,
-                                public ui::InputDeviceEventObserver,
                                 public ash::SessionStateObserver,
                                 public content::NotificationObserver {
  public:
-  // Attempts to create a palette delegate. This will return null if the palette
-  // feature is not enabled.
-  static std::unique_ptr<PaletteDelegateChromeOS> Create();
-
+  PaletteDelegateChromeOS();
   ~PaletteDelegateChromeOS() override;
 
  private:
-  PaletteDelegateChromeOS();
-
   // ash::PaletteDelegate:
   std::unique_ptr<EnableListenerSubscription> AddPaletteEnableListener(
       const EnableListener& on_state_changed) override;
   void CreateNote() override;
   bool HasNoteApp() override;
-  void SetStylusStateChangedCallback(
-      const OnStylusStateChangedCallback& on_stylus_state_changed) override;
   bool ShouldAutoOpenPalette() override;
   bool ShouldShowPalette() override;
   void TakeScreenshot() override;
@@ -62,9 +53,6 @@ class PaletteDelegateChromeOS : public ash::PaletteDelegate,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
-  // ui::InputDeviceObserver:
-  void OnStylusStateChanged(ui::StylusState state) override;
-
   // Called when the palette enabled pref has changed.
   void OnPaletteEnabledPrefChanged();
 
@@ -72,7 +60,6 @@ class PaletteDelegateChromeOS : public ash::PaletteDelegate,
   void OnPartialScreenshotDone(const base::Closure& then);
 
   base::CallbackList<void(bool)> palette_enabled_callback_list_;
-  OnStylusStateChangedCallback on_stylus_state_changed_;
 
   // Unowned pointer to the active profile.
   Profile* profile_ = nullptr;