Use standardized and extendable accelerometer update type.

ash/wm/maximize_mode/maximize_mode_controller.h

Index: ash/wm/maximize_mode/maximize_mode_controller.h
diff --git a/ash/wm/maximize_mode/maximize_mode_controller.h b/ash/wm/maximize_mode/maximize_mode_controller.h
index 326e8f8d386b6ee3e218f122180d6392c590570c..899494ed8b48e4efe4e095cd54f9909fce750f69 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller.h
+++ b/ash/wm/maximize_mode/maximize_mode_controller.h
@@ -109,8 +109,8 @@ class ASH_EXPORT MaximizeModeController
   void Shutdown();
 
   // AccelerometerObserver:
-  virtual void OnAccelerometerUpdated(const gfx::Vector3dF& base,
-                                      const gfx::Vector3dF& lid) OVERRIDE;
+  virtual void OnAccelerometerUpdated(
+      const chromeos::AccelerometerUpdate& update) OVERRIDE;
 
   // ShellObserver:
   virtual void OnAppTerminating() OVERRIDE;