device/bluetooth: Move GATT observer methods to BluetoothAdapter::Observer.

device/bluetooth/bluetooth_device_chromeos.h

Index: device/bluetooth/bluetooth_device_chromeos.h
diff --git a/device/bluetooth/bluetooth_device_chromeos.h b/device/bluetooth/bluetooth_device_chromeos.h
index b7247f5571a23ee449052b39f2ced3745d86b27a..6f335603cd630f73abc171d6a1a2b5c65e904d24 100644
--- a/device/bluetooth/bluetooth_device_chromeos.h
+++ b/device/bluetooth/bluetooth_device_chromeos.h
@@ -10,7 +10,6 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/observer_list.h"
 #include "base/sequenced_task_runner.h"
 #include "chromeos/dbus/bluetooth_device_client.h"
 #include "chromeos/dbus/bluetooth_gatt_service_client.h"
@@ -33,10 +32,6 @@ class BluetoothDeviceChromeOS
       public BluetoothGattServiceClient::Observer {
  public:
   // BluetoothDevice override
-  virtual void AddObserver(
-      device::BluetoothDevice::Observer* observer) OVERRIDE;
-  virtual void RemoveObserver(
-      device::BluetoothDevice::Observer* observer) OVERRIDE;
   virtual uint32 GetBluetoothClass() const OVERRIDE;
   virtual std::string GetAddress() const OVERRIDE;
   virtual VendorIDSource GetVendorIDSource() const OVERRIDE;
@@ -172,9 +167,6 @@ class BluetoothDeviceChromeOS
   // The dbus object path of the device object.
   dbus::ObjectPath object_path_;
 
-  // List of observers interested in event notifications from us.
-  ObserverList<device::BluetoothDevice::Observer> observers_;
-
   // Number of ongoing calls to Connect().
   int num_connecting_calls_;