Convert string16 to base::string16 in content.

content/browser/indexed_db/indexed_db_index_writer.h

 // Copyright (c) 2013 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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_INDEX_WRITER_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_INDEX_WRITER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 16 matching lines @@
   IndexWriter(const IndexedDBIndexMetadata& index_metadata,
               const IndexedDBDatabase::IndexKeys& index_keys);
 
   bool VerifyIndexKeys(IndexedDBBackingStore* store,
                        IndexedDBBackingStore::Transaction* transaction,
                        int64 database_id,
                        int64 object_store_id,
                        int64 index_id,
                        bool* can_add_keys,
                        const IndexedDBKey& primary_key,
-                       string16* error_message) const WARN_UNUSED_RESULT;
+                       base::string16* error_message) const WARN_UNUSED_RESULT;
 
   void WriteIndexKeys(const IndexedDBBackingStore::RecordIdentifier& record,
                       IndexedDBBackingStore* store,
                       IndexedDBBackingStore::Transaction* transaction,
                       int64 database_id,
                       int64 object_store_id) const;
 
   ~IndexWriter();
 
  private:
@@ skipping 13 matching lines @@
 bool MakeIndexWriters(
     scoped_refptr<IndexedDBTransaction> transaction,
     IndexedDBBackingStore* store,
     int64 database_id,
     const IndexedDBObjectStoreMetadata& metadata,
     const IndexedDBKey& primary_key,
     bool key_was_generated,
     const std::vector<int64>& index_ids,
     const std::vector<IndexedDBDatabase::IndexKeys>& index_keys,
     ScopedVector<IndexWriter>* index_writers,
-    string16* error_message,
+    base::string16* error_message,
     bool* completed) WARN_UNUSED_RESULT;
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_INDEX_WRITER_H_