Upgrade the history database to version 23

chrome/browser/history/android/android_urls_database.h

Index: chrome/browser/history/android/android_urls_database.h
diff --git a/chrome/browser/history/android/android_urls_database.h b/chrome/browser/history/android/android_urls_database.h
index 0065fccab300ac08bbd7426cfc2737bd7d20a961..fda6354392f4fd6c27c9459d068214a686a5d49e 100644
--- a/chrome/browser/history/android/android_urls_database.h
+++ b/chrome/browser/history/android/android_urls_database.h
@@ -56,6 +56,9 @@ class AndroidURLsDatabase {
   // on error.
   bool ClearAndroidURLRows();
 
+  // Migrate from version 21 to 22.
+  bool MigrateToVersion22();
+
  protected:
   // Returns the database for the functions in this interface. The decendent of
   // this class implements these functions to return its objects.