Revert of [sync] Add Sessions integration tests

chrome/browser/sync/test/integration/session_hierarchy_match_checker.h

-// Copyright (c) 2017 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.
-
-#ifndef CHROME_BROWSER_SYNC_TEST_INTEGRATION_SESSION_HIERARCHY_MATCH_CHECKER_H_
-#define CHROME_BROWSER_SYNC_TEST_INTEGRATION_SESSION_HIERARCHY_MATCH_CHECKER_H_
-
-#include "chrome/browser/sync/test/integration/single_client_status_change_checker.h"
-#include "components/sync/test/fake_server/fake_server_verifier.h"
-#include "components/sync/test/fake_server/sessions_hierarchy.h"
-
-// Checker to block until the FakeServer records a SessionsHierarchy identical
-// to the SessionsHierarchy specified in the constructor.
-class SessionHierarchyMatchChecker : public SingleClientStatusChangeChecker {
- public:
-  SessionHierarchyMatchChecker(
-      const fake_server::SessionsHierarchy& sessions_hierarchy,
-      browser_sync::ProfileSyncService* service,
-      fake_server::FakeServer* fake_server);
-
-  // StatusChangeChecker implementation.
-  bool IsExitConditionSatisfied() override;
-  std::string GetDebugMessage() const override;
-
- private:
-  const fake_server::SessionsHierarchy sessions_hierarchy_;
-  fake_server::FakeServerVerifier verifier_;
-};
-
-#endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_SESSION_HIERARCHY_MATCH_CHECKER_H_