Move JoinString to the base namespace

components/view_manager/test_change_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/view_manager/test_change_tracker.h"
 
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "components/view_manager/public/cpp/util.h"
 #include "mojo/common/common_type_converters.h"
@@ skipping 115 matching lines @@
     return "more than one changes and expected only one";
   return views[0].ToString();
 }
 
 std::string ChangeViewDescription(const std::vector<Change>& changes) {
   if (changes.size() != 1)
     return std::string();
   std::vector<std::string> view_strings(changes[0].views.size());
   for (size_t i = 0; i < changes[0].views.size(); ++i)
     view_strings[i] = "[" + changes[0].views[i].ToString() + "]";
-  return JoinString(view_strings, ',');
+  return base::JoinString(view_strings, ",");
 }
 
 TestView ViewDataToTestView(const ViewDataPtr& data) {
   TestView view;
   view.parent_id = data->parent_id;
   view.view_id = data->view_id;
   view.visible = data->visible;
   view.drawn = data->drawn;
   view.properties =
       data->properties.To<std::map<std::string, std::vector<uint8_t>>>();
@@ skipping 177 matching lines @@
 
 std::string TestView::ToString2() const {
   return base::StringPrintf("view=%s parent=%s visible=%s drawn=%s",
                             ViewIdToString(view_id).c_str(),
                             ViewIdToString(parent_id).c_str(),
                             visible ? "true" : "false",
                             drawn ? "true" : "false");
 }
 
 }  // namespace view_manager