Extract GetNodeByID() method from BookmarkModel.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller_unittest.mm

 // Copyright (c) 2012 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/string16.h"
@@ skipping 685 matching lines @@
   bookmark_utils::AddIfNotBookmarked(
       model, GURL("http://www.cnn.com"), ASCIIToUTF16("bigger title"));
   menu = [bar_ menuForFolderNode:model->bookmark_bar_node()];
   EXPECT_EQ([menu numberOfItems], 2);
   NSMenuItem *item = [menu itemWithTitle:@"bigger title"];
   EXPECT_TRUE(item);
   item = [menu itemWithTitle:@"small"];
   EXPECT_TRUE(item);
   if (item) {
     int64 tag = [bar_ nodeIdFromMenuTag:[item tag]];
-    const BookmarkNode* node = model->GetNodeByID(tag);
+    const BookmarkNode* node = GetBookmarkNodeByID(model, tag);
     EXPECT_TRUE(node);
     EXPECT_EQ(gurl, node->url());
   }
 
   // Test with an actual folder as well
   const BookmarkNode* parent = model->bookmark_bar_node();
   const BookmarkNode* folder = model->AddFolder(parent,
                                                 parent->child_count(),
                                                 ASCIIToUTF16("folder"));
   model->AddURL(folder, folder->child_count(),
@@ skipping 1357 matching lines @@
                              "2f3b ] 4b ");
   actual = test::ModelStringFromNode(root);
   EXPECT_EQ(expected, actual);
 
   // Verify that the other bookmark folder can't be deleted.
   BookmarkButton *otherButton = [bar_ otherBookmarksButton];
   EXPECT_FALSE([bar_ canDragBookmarkButtonToTrash:otherButton]);
 }
 
 }  // namespace