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

device/bluetooth/bluetooth_device_win.cc

Index: device/bluetooth/bluetooth_device_win.cc
diff --git a/device/bluetooth/bluetooth_device_win.cc b/device/bluetooth/bluetooth_device_win.cc
index b4c78162ee1bd27d0530aa217cda208c107eb1d6..db79c6aaf3ac3cc831d63fdd302658326d0e6522 100644
--- a/device/bluetooth/bluetooth_device_win.cc
+++ b/device/bluetooth/bluetooth_device_win.cc
@@ -61,19 +61,6 @@ void BluetoothDeviceWin::SetVisible(bool visible) {
   visible_ = visible;
 }
 
-void BluetoothDeviceWin::AddObserver(
-    device::BluetoothDevice::Observer* observer) {
-  DCHECK(observer);
-  observers_.AddObserver(observer);
-}
-
-void BluetoothDeviceWin::RemoveObserver(
-    device::BluetoothDevice::Observer* observer) {
-  DCHECK(observer);
-  observers_.RemoveObserver(observer);
-}
-
-
 uint32 BluetoothDeviceWin::GetBluetoothClass() const {
   return bluetooth_class_;
 }