Move ntp_tiles classes to namespace ntp_tiles.

components/ntp_tiles/most_visited_sites_unittest.cc

 // Copyright 2015 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/ntp_tiles/most_visited_sites.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace ntp_tiles {
+
 namespace {
 
 struct TitleURL {
   TitleURL(const std::string& title, const std::string& url)
       : title(base::UTF8ToUTF16(title)), url(url) {}
   TitleURL(const base::string16& title, const std::string& url)
       : title(title), url(url) {}
 
   base::string16 title;
   std::string url;
@@ skipping 103 matching lines @@
   std::vector<TitleURL> expected_sites{
       TitleURL("Site 3", "https://www.site3.com/"),
       TitleURL("Site 4", "https://www.site4.com/"),
       TitleURL("Site 1", "https://www.site1.com/"),
       TitleURL("Site 2", "https://www.site2.com/"),
   };
   std::vector<bool> expected_sites_source{true, true, false, false};
   Check(popular_sites, std::vector<TitleURL>(), personal_sites,
         expected_sites_source, expected_sites);
 }
+
+}  // namespace ntp_tiles