chromeos: Convert system tray session length limit to mojo

ash/test/test_system_tray_delegate.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 "ash/test/test_system_tray_delegate.h"
 
-#include <string>
-
-#include "ash/shell.h"
-#include "base/time/time.h"
-
 namespace ash {
 namespace test {
 
 TestSystemTrayDelegate::TestSystemTrayDelegate() = default;
 
 TestSystemTrayDelegate::~TestSystemTrayDelegate() = default;
 
-void TestSystemTrayDelegate::SetSessionLengthLimitForTest(
-    const base::TimeDelta& new_limit) {
-  session_length_limit_ = new_limit;
-  session_length_limit_set_ = true;
-}
-
-void TestSystemTrayDelegate::ClearSessionLengthLimit() {
-  session_length_limit_set_ = false;
-}
-
 void TestSystemTrayDelegate::SetCurrentIME(const IMEInfo& info) {
   current_ime_ = info;
 }
 
 void TestSystemTrayDelegate::SetAvailableIMEList(const IMEInfoList& list) {
   ime_list_ = list;
 }
 
-bool TestSystemTrayDelegate::GetSessionStartTime(
-    base::TimeTicks* session_start_time) {
-  // Just returns TimeTicks::Now(), so the remaining time is always the
-  // specified limit. This is useful for testing.
-  if (session_length_limit_set_)
-    *session_start_time = base::TimeTicks::Now();
-  return session_length_limit_set_;
-}
-
-bool TestSystemTrayDelegate::GetSessionLengthLimit(
-    base::TimeDelta* session_length_limit) {
-  if (session_length_limit_set_)
-    *session_length_limit = session_length_limit_;
-  return session_length_limit_set_;
-}
-
 void TestSystemTrayDelegate::GetCurrentIME(IMEInfo* info) {
   *info = current_ime_;
 }
 
 void TestSystemTrayDelegate::GetAvailableIMEList(IMEInfoList* list) {
   *list = ime_list_;
 }
 
 }  // namespace test
 }  // namespace ash