Remove old webui History page on desktop and mobile

chrome/test/data/webui/history_ui_browsertest.h

 // 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.
 
 #ifndef CHROME_TEST_DATA_WEBUI_HISTORY_UI_BROWSERTEST_H_
 #define CHROME_TEST_DATA_WEBUI_HISTORY_UI_BROWSERTEST_H_
 
-#include "base/time/time.h"
-
 #include "base/macros.h"
 #include "chrome/test/base/web_ui_browser_test.h"
 
 namespace history {
 class HistoryService;
 }
 
 class HistoryUIBrowserTest : public WebUIBrowserTest {
  public:
   HistoryUIBrowserTest();
   ~HistoryUIBrowserTest() override;
 
   void SetUpOnMainThread() override;
 
  protected:
   // Sets the pref to allow or prohibit deleting history entries.
   void SetDeleteAllowed(bool allowed);
 
-  // Add a test entry to the history database. The timestamp for the entry will
-  // be |hour_offset| hours after |baseline_time_|.
-  void AddPageToHistory(
-      int hour_offset, const std::string& url, const std::string& title);
-
-  // Clears kAcceptLanguages pref value.
-  void ClearAcceptLanguages();
-
  private:
   // The HistoryService is owned by the profile.
   history::HistoryService* history_;
 
-  // The time from which entries added via AddPageToHistory() will be offset.
-  base::Time baseline_time_;
-
-  // Counter used to generate a unique ID for each page added to the history.
-  int nav_entry_id_;
-
   DISALLOW_COPY_AND_ASSIGN(HistoryUIBrowserTest);
 };
 
 #endif  // CHROME_TEST_DATA_WEBUI_HISTORY_UI_BROWSERTEST_H_