history: Move kBookmarkBarID constant out of HistoryService.

chrome/browser/history/starred_url_database.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_STARRED_URL_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_STARRED_URL_DATABASE_H_
 #pragma once
 
 #include <set>
 
@@ skipping 21 matching lines @@
   // URLDatabase before using this class' functions.
   StarredURLDatabase();
   virtual ~StarredURLDatabase();
 
  protected:
   // The unit tests poke our innards.
   friend class HistoryTest;
   friend class StarredURLDatabaseTest;
   FRIEND_TEST_ALL_PREFIXES(HistoryTest, CreateStarFolder);
 
+  // ID (both star_id and folder_id) of the bookmark bar.
+  // This entry always exists.
+  static const int64 kBookmarkBarID;
+
   // Writes bookmarks to the specified file.
   bool MigrateBookmarksToFile(const FilePath& path);
 
   // Returns the database for the functions in this interface.
   virtual sql::Connection& GetDB() = 0;
 
  private:
   // Makes sure the starred table is in a sane state. This does the following:
   // . Makes sure there is a bookmark bar and other nodes. If no bookmark bar
   //   node is found, the table is dropped and recreated.
@@ skipping 125 matching lines @@
   // Does the work of migrating bookmarks to a temporary file that
   // BookmarkStorage will read from.
   bool MigrateBookmarksToFileImpl(const FilePath& path);
 
   DISALLOW_COPY_AND_ASSIGN(StarredURLDatabase);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_STARRED_URL_DATABASE_H_