mash: Remove ShelfDelegate; move functions to ShelfModel.

ash/mus/shelf_delegate_mus.cc

-// Copyright 2016 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 "ash/mus/shelf_delegate_mus.h"
-
-#include "ash/shelf/shelf_controller.h"
-#include "ash/shell.h"
-#include "base/strings/string_util.h"
-
-namespace ash {
-
-ShelfDelegateMus::ShelfDelegateMus() {}
-
-ShelfDelegateMus::~ShelfDelegateMus() {}
-
-///////////////////////////////////////////////////////////////////////////////
-// ShelfDelegate:
-
-ShelfID ShelfDelegateMus::GetShelfIDForAppID(const std::string& app_id) {
-  if (Shell::Get()->shelf_controller()->app_id_to_shelf_id().count(app_id))
-    return Shell::Get()->shelf_controller()->app_id_to_shelf_id().at(app_id);
-  return 0;
-}
-
-ShelfID ShelfDelegateMus::GetShelfIDForAppIDAndLaunchID(
-    const std::string& app_id,
-    const std::string& launch_id) {
-  return ShelfDelegateMus::GetShelfIDForAppID(app_id);
-}
-
-const std::string& ShelfDelegateMus::GetAppIDForShelfID(ShelfID id) {
-  if (Shell::Get()->shelf_controller()->shelf_id_to_app_id().count(id))
-    return Shell::Get()->shelf_controller()->shelf_id_to_app_id().at(id);
-  return base::EmptyString();
-}
-
-void ShelfDelegateMus::PinAppWithID(const std::string& app_id) {
-  NOTIMPLEMENTED();
-}
-
-bool ShelfDelegateMus::IsAppPinned(const std::string& app_id) {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-void ShelfDelegateMus::UnpinAppWithID(const std::string& app_id) {
-  NOTIMPLEMENTED();
-}
-
-}  // namespace ash