Use chromeos accelerometer reader and support only lid accelerometer.

ash/accelerometer/accelerometer_controller.h

Index: ash/accelerometer/accelerometer_controller.h
diff --git a/ash/accelerometer/accelerometer_controller.h b/ash/accelerometer/accelerometer_controller.h
index 8bda2a613320f95de56121543690c332bf2e6ce8..61a81cb08a809186ffbf6e917d0caa2e43eb6ada 100644
--- a/ash/accelerometer/accelerometer_controller.h
+++ b/ash/accelerometer/accelerometer_controller.h
@@ -36,7 +36,7 @@ class ASH_EXPORT AccelerometerController
   virtual ~AccelerometerController();
 
   // Initialize the accelerometer reader.
-  void Initialize(scoped_refptr<base::TaskRunner> blocking_task_runner);
+  void Initialize(scoped_refptr<base::TaskRunner> file_task_runner);
 
   // Add/remove observer.
   void AddObserver(AccelerometerObserver* observer);