Converts WmActivationObserver to aura::client::ActivationChangeObserver

chrome/browser/chromeos/arc/boot_phase_monitor/arc_instance_throttle.h

Index: chrome/browser/chromeos/arc/boot_phase_monitor/arc_instance_throttle.h
diff --git a/chrome/browser/chromeos/arc/boot_phase_monitor/arc_instance_throttle.h b/chrome/browser/chromeos/arc/boot_phase_monitor/arc_instance_throttle.h
index 00c8f87f4cc188e59095c07106541aa68240030f..181eadd97e8261afb304d43127db7aa6f74ad207 100644
--- a/chrome/browser/chromeos/arc/boot_phase_monitor/arc_instance_throttle.h
+++ b/chrome/browser/chromeos/arc/boot_phase_monitor/arc_instance_throttle.h
@@ -5,22 +5,23 @@
 #ifndef CHROME_BROWSER_CHROMEOS_ARC_BOOT_PHASE_MONITOR_ARC_INSTANCE_THROTTLE_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_BOOT_PHASE_MONITOR_ARC_INSTANCE_THROTTLE_H_
 
-#include "ash/common/wm_activation_observer.h"
 #include "base/macros.h"
+#include "ui/wm/public/activation_change_observer.h"
 
 namespace arc {
 
 // A class that watches window activations and prioritizes the ARC instance when
 // one of ARC windows is activated. The class also unprioritizes the instance
 // when non-ARC window such as Chrome is activated.
-class ArcInstanceThrottle : public ash::WmActivationObserver {
+class ArcInstanceThrottle : public aura::client::ActivationChangeObserver {
  public:
   ArcInstanceThrottle();
   ~ArcInstanceThrottle() override;
 
-  // ash::WmActivationObserver overrides:
-  void OnWindowActivated(ash::WmWindow* gained_active,
-                         ash::WmWindow* lost_active) override;
+  // aura::client::ActivationChangeObserver overrides:
+  void OnWindowActivated(ActivationReason reason,
+                         aura::Window* gained_active,
+                         aura::Window* lost_active) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ArcInstanceThrottle);