Revert 137968 - Adding four bezel gestures

ash/accelerators/accelerator_controller.h

Index: ash/accelerators/accelerator_controller.h
===================================================================
--- ash/accelerators/accelerator_controller.h	(revision 137969)
+++ ash/accelerators/accelerator_controller.h	(working copy)
@@ -77,10 +77,6 @@
     return brightness_control_delegate_.get();
   }
 
-  VolumeControlDelegate* volume_control_delegate() const {
-    return volume_control_delegate_.get();
-  }
-
  private:
   // Initializes the accelerators this class handles as a target.
   void Init();