[chrome.displaySource] further implementation of call completion callbacks

extensions/renderer/api/display_source/display_source_session.cc

 // Copyright 2015 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 "extensions/renderer/api/display_source/display_source_session.h"
 
 #if defined(ENABLE_WIFI_DISPLAY)
 #include "extensions/renderer/api/display_source/wifi_display/wifi_display_session.h"
 #endif
 
 namespace extensions {
 
 DisplaySourceSessionParams::DisplaySourceSessionParams()
     : auth_method(api::display_source::AUTHENTICATION_METHOD_NONE) {
 }
 
 DisplaySourceSessionParams::~DisplaySourceSessionParams() = default;
 
 DisplaySourceSession::DisplaySourceSession()
     : state_(Idle) {
 }
 
 DisplaySourceSession::~DisplaySourceSession() = default;
 
-void DisplaySourceSession::SetCallbacks(
-    const SinkIdCallback& started_callback,
-    const SinkIdCallback& terminated_callback,
+void DisplaySourceSession::SetNotificationCallbacks(
+    const base::Closure& terminated_callback,
     const ErrorCallback& error_callback) {
-  DCHECK(started_callback_.is_null());
   DCHECK(terminated_callback_.is_null());
   DCHECK(error_callback_.is_null());
 
-  started_callback_ = started_callback;
   terminated_callback_ = terminated_callback;
   error_callback_ = error_callback;
 }
 
 scoped_ptr<DisplaySourceSession> DisplaySourceSessionFactory::CreateSession(
     const DisplaySourceSessionParams& params) {
 #if defined(ENABLE_WIFI_DISPLAY)
   return scoped_ptr<DisplaySourceSession>(new WiFiDisplaySession(params));
 #endif
   return nullptr;
 }
 
 }  // namespace extensions