bluetooth: Refactor (Add|Remove)Observer impls into BluetoothAdapter.

device/bluetooth/bluetooth_adapter_chromeos.cc

 // Copyright 2013 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.
 
 #include "device/bluetooth/bluetooth_adapter_chromeos.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 126 matching lines @@
 BluetoothAdapterChromeOS::~BluetoothAdapterChromeOS() {
   Shutdown();
 }
 
 void BluetoothAdapterChromeOS::DeleteOnCorrectThread() const {
   if (ui_task_runner_->RunsTasksOnCurrentThread() ||
       !ui_task_runner_->DeleteSoon(FROM_HERE, this))
     delete this;
 }
 
-void BluetoothAdapterChromeOS::AddObserver(
-    BluetoothAdapter::Observer* observer) {
-  DCHECK(observer);
-  observers_.AddObserver(observer);
-}
-
-void BluetoothAdapterChromeOS::RemoveObserver(
-    BluetoothAdapter::Observer* observer) {
-  DCHECK(observer);
-  observers_.RemoveObserver(observer);
-}
-
 std::string BluetoothAdapterChromeOS::GetAddress() const {
   if (!IsPresent())
     return std::string();
 
   BluetoothAdapterClient::Properties* properties =
       DBusThreadManager::Get()->GetBluetoothAdapterClient()->
           GetProperties(object_path_);
   DCHECK(properties);
 
   return BluetoothDevice::CanonicalizeAddress(properties->address.value());
@@ skipping 1252 matching lines @@
 
     // If the queued request resulted in a pending call, then let it
     // asynchonously process the remaining queued requests once the pending
     // call returns.
     if (discovery_request_pending_)
       return;
   }
 }
 
 }  // namespace chromeos