Port BrowsingDataDatabaseHelper to webkit_database::DatabaseIdentifier

webkit/common/database/database_identifier.h

Index: webkit/common/database/database_identifier.h
diff --git a/webkit/common/database/database_identifier.h b/webkit/common/database/database_identifier.h
index dd261f00e1786c4a24b09d972e97b2b7bbf1b94f..91973a1016b9fd3263256254280373e67f7039ef 100644
--- a/webkit/common/database/database_identifier.h
+++ b/webkit/common/database/database_identifier.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef WEBKIT_COMMON_DATABASE_DATABASE_IDENTIFIER_H_
+#define WEBKIT_COMMON_DATABASE_DATABASE_IDENTIFIER_H_
+
 #include <string>
 
 #include "base/basictypes.h"
@@ -47,3 +50,5 @@ class WEBKIT_STORAGE_COMMON_EXPORT DatabaseIdentifier {
 };
 
 }  // namespace webkit_database
+
+#endif  // WEBKIT_COMMON_DATABASE_DATABASE_IDENTIFIER_H_