Revert of Added bluetooth LE support on Mac platform

device/bluetooth/bluetooth_discovery_manager_mac.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DEVICE_BLUETOOTH_BLUETOOTH_DISCOVERY_MANAGER_MAC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_DISCOVERY_MANAGER_MAC_H_
 
 #include "base/macros.h"
 
 @class IOBluetoothDevice;
@@ skipping 10 matching lines @@
    public:
     // Called when |this| manager has found a device through classic device
     // inquiry in the form of an IOBluetoothDevice.
     virtual void DeviceFound(IOBluetoothDevice* device) = 0;
 
     // Called when device discovery is no longer running, due to either a call
     // to BluetoothDiscoveryManagerMac::StopDiscovery or an unexpected reason,
     // such as when a user disables the controller, in which case the value of
     // |unexpected| will be true.
     virtual void DiscoveryStopped(bool unexpected) = 0;
-
-   protected:
-    virtual ~Observer() {}
   };
 
   virtual ~BluetoothDiscoveryManagerMac();
 
   // Returns true, if discovery is currently being performed.
   virtual bool IsDiscovering() const = 0;
 
   // Initiates a discovery session. Returns true on success or if discovery
   // is already running. Returns false on failure.
   virtual bool StartDiscovery() = 0;
@@ skipping 14 matching lines @@
   // Observer interested in notifications from us.
   Observer* observer_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothDiscoveryManagerMac);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_DISCOVERY_MANAGER_MAC_H_