Move BookmarkNodeData into bookmarks namespace.

components/bookmarks/browser/bookmark_node_data_ios.cc

 // Copyright 2014 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 "components/bookmarks/browser/bookmark_node_data.h"
 
 #include "base/logging.h"
 
+namespace bookmarks {
+
 // static
 bool BookmarkNodeData::ClipboardContainsBookmarks() {
   NOTREACHED();
   return false;
 }
 
 void BookmarkNodeData::WriteToClipboard(ui::ClipboardType type) {
   NOTREACHED();
 }
 
 bool BookmarkNodeData::ReadFromClipboard(ui::ClipboardType type) {
   NOTREACHED();
   return false;
 }
+
+}  // namespace bookmarks