Extract GetNodeByID() method from BookmarkModel.

chrome/browser/bookmarks/bookmark_expanded_state_tracker.cc

Index: chrome/browser/bookmarks/bookmark_expanded_state_tracker.cc
diff --git a/chrome/browser/bookmarks/bookmark_expanded_state_tracker.cc b/chrome/browser/bookmarks/bookmark_expanded_state_tracker.cc
index 95f49402cf936049393667267a83b50e5e04cb0d..8090ab8ac0e6ad1ef7a6c9a4b7c71158cdad12a8 100644
--- a/chrome/browser/bookmarks/bookmark_expanded_state_tracker.cc
+++ b/chrome/browser/bookmarks/bookmark_expanded_state_tracker.cc
@@ -8,7 +8,7 @@
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
-#include "chrome/browser/bookmarks/bookmark_model_factory.h"
+#include "chrome/browser/bookmarks/bookmark_utils.h"
 #include "components/bookmarks/core/common/bookmark_pref_names.h"
 
 BookmarkExpandedStateTracker::BookmarkExpandedStateTracker(
@@ -47,8 +47,8 @@ BookmarkExpandedStateTracker::GetExpandedNodes() {
     int64 node_id;
     const BookmarkNode* node;
     if ((*i)->GetAsString(&value) && base::StringToInt64(value, &node_id) &&
-        (node = bookmark_model_->GetNodeByID(node_id)) != NULL &&
-        node->is_folder()) {
+        (node = bookmark_utils::GetNodeByID(bookmark_model_, node_id)) !=
+            NULL && node->is_folder()) {
       nodes.insert(node);
     } else {
       changed = true;