Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/ui/gtk/bookmarks/bookmark_tree_model.cc

 // 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.
 
 #include "chrome/browser/ui/gtk/bookmarks/bookmark_tree_model.h"
 
 #include <gtk/gtk.h>
 
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 12 matching lines @@
   // It would be easy to show a different icon when the folder is open (as they
   // do on Windows, for example), using pixbuf-expander-closed and
   // pixbuf-expander-open. Unfortunately there is no GTK_STOCK_OPEN_DIRECTORY
   // (and indeed, Nautilus does not render an expanded directory any
   // differently).
   gtk_tree_store_set(store,
                      iter,
                      FOLDER_ICON,
                      GtkThemeService::GetFolderIcon(true).ToGdkPixbuf(),
                      FOLDER_NAME,
-                     UTF16ToUTF8(node->GetTitle()).c_str(),
+                     base::UTF16ToUTF8(node->GetTitle()).c_str(),
                      ITEM_ID,
                      node->id(),
                      // We don't want to use node->is_folder() because that
                      // would let the
                      // user edit "Bookmarks Bar" and "Other Bookmarks".
                      IS_EDITABLE,
                      node->type() == BookmarkNode::FOLDER,
                      -1);
 }
 
@@ skipping 182 matching lines @@
 
   return ret_val;
 }
 
 base::string16 GetTitleFromTreeIter(GtkTreeModel* model, GtkTreeIter* iter) {
   GValue value = { 0, };
   base::string16 ret_val;
   gtk_tree_model_get_value(model, iter, FOLDER_NAME, &value);
   if (G_VALUE_HOLDS_STRING(&value)) {
     const gchar* utf8str = g_value_get_string(&value);
-    ret_val = UTF8ToUTF16(utf8str);
+    ret_val = base::UTF8ToUTF16(utf8str);
     g_value_unset(&value);
   } else {
     NOTREACHED() << "Impossible type mismatch";
   }
 
   return ret_val;
 }