[Media Router] 2nd take on fix route response callback lifetime in UI.

chrome/browser/media/router/create_session_request.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 "chrome/browser/media/router/create_session_request.h"
-
-#include "chrome/browser/media/router/media_source_helper.h"
-
-using content::PresentationSessionInfo;
-using content::PresentationError;
-
-namespace media_router {
-
-CreateSessionRequest::CreateSessionRequest(
-    const std::string& presentation_url,
-    const std::string& presentation_id,
-    const GURL& frame_url,
-    const PresentationSessionSuccessCallback& success_cb,
-    const PresentationSessionErrorCallback& error_cb)
-    : presentation_info_(presentation_url, presentation_id),
-      media_source_(presentation_url),
-      frame_url_(frame_url),
-      success_cb_(success_cb),
-      error_cb_(error_cb),
-      cb_invoked_(false) {
-}
-
-CreateSessionRequest::~CreateSessionRequest() {
-}
-
-void CreateSessionRequest::MaybeInvokeSuccessCallback(
-    const MediaRoute::Id& route_id) {
-  if (!cb_invoked_) {
-    // Overwrite presentation ID.
-    success_cb_.Run(content::PresentationSessionInfo(
-                        presentation_info_.presentation_url,
-                        GetPresentationIdAndUrl(route_id).first),
-                    route_id);
-    cb_invoked_ = true;
-  }
-}
-
-void CreateSessionRequest::MaybeInvokeErrorCallback(
-    const content::PresentationError& error) {
-  if (!cb_invoked_) {
-    error_cb_.Run(error);
-    cb_invoked_ = true;
-  }
-}
-
-}  // namespace media_router