Move BookmarkExpandedStateTracker into bookmarks namespace.

components/bookmarks/browser/bookmark_expanded_state_tracker.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_expanded_state_tracker.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/bookmarks/browser/bookmark_utils.h"
 #include "components/bookmarks/common/bookmark_pref_names.h"
 
+namespace bookmarks {
+
 BookmarkExpandedStateTracker::BookmarkExpandedStateTracker(
     BookmarkModel* bookmark_model,
     PrefService* pref_service)
     : bookmark_model_(bookmark_model),
       pref_service_(pref_service) {
   bookmark_model->AddObserver(this);
 }
 
 BookmarkExpandedStateTracker::~BookmarkExpandedStateTracker() {
 }
@@ skipping 77 matching lines @@
     return;
 
   base::ListValue values;
   for (Nodes::const_iterator i = nodes.begin(); i != nodes.end(); ++i) {
     values.Set(values.GetSize(),
                new base::StringValue(base::Int64ToString((*i)->id())));
   }
 
   pref_service_->Set(prefs::kBookmarkEditorExpandedNodes, values);
 }
+
+}  // namespace bookmarks