Generalize migration code in WebDatabase.

chrome/browser/webdata/web_intents_table.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/webdata/web_intents_table.h"
 #include <string>
 
 #include "base/i18n/case_conversion.h"
 #include "base/logging.h"
 #include "base/string_util.h"
@@ skipping 53 matching lines @@
   }
 
   return true;
 }
 
 // TODO(jhawkins): Figure out Sync story.
 bool WebIntentsTable::IsSyncable() {
   return false;
 }
 
+bool WebIntentsTable::MigrateToVersion(int version,
+                                       const std::string& app_locale,
+                                       bool* update_compatible_version) {
+  if (version == 46) {
+    *update_compatible_version = true;
+    return MigrateToVersion46AddSchemeColumn();
+  }
+
+  return true;
+}
+
 // Updates the table by way of renaming the old tables, rerunning
 // the Init method, then selecting old values into the new tables.
 bool WebIntentsTable::MigrateToVersion46AddSchemeColumn() {
 
   if (!db_->Execute("ALTER TABLE web_intents RENAME TO old_web_intents")) {
     DLOG(WARNING) << "Could not backup web_intents table.";
     return false;
   }
 
   if (!db_->Execute("ALTER TABLE web_intents_defaults"
@@ skipping 34 matching lines @@
     return false;
   }
 
   if (!db_->Execute("DROP table old_web_intents_defaults")) {
     DLOG(WARNING) << "Could not drop backup web_intents_defaults table.";
     return false;
   }
 
   return true;
 }