history: Move kBookmarkBarID constant out of HistoryService.

chrome/browser/history/history.h

 // Copyright (c) 2011 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_HISTORY_HISTORY_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_H_
 #pragma once
 
 #include <set>
 #include <vector>
@@ skipping 82 matching lines @@
 //
 // This service is thread safe. Each request callback is invoked in the
 // thread that made the request.
 class HistoryService : public CancelableRequestProvider,
                        public NotificationObserver,
                        public base::RefCountedThreadSafe<HistoryService> {
  public:
   // Miscellaneous commonly-used types.
   typedef std::vector<PageUsageData*> PageUsageDataList;
 
-  // ID (both star_id and folder_id) of the bookmark bar.
-  // This entry always exists.
-  static const history::StarID kBookmarkBarID;
-
   // Must call Init after construction.
   explicit HistoryService(Profile* profile);
   // The empty constructor is provided only for testing.
   HistoryService();
 
   // Initializes the history service, returning true on success. On false, do
   // not call any other functions. The given directory will be used for storing
   // the history files. The BookmarkService is used when deleting URLs to
   // test if a URL is bookmarked; it may be NULL during testing.
   bool Init(const FilePath& history_dir, BookmarkService* bookmark_service) {
@@ skipping 756 matching lines @@
   BookmarkService* bookmark_service_;
   bool no_db_;
 
   // True if needs top site migration.
   bool needs_top_sites_migration_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_H_