Move ntp_tiles classes to namespace ntp_tiles.

components/ntp_tiles/popular_sites.h

 // 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.
 
 #ifndef COMPONENTS_NTP_TILES_POPULAR_SITES_H_
 #define COMPONENTS_NTP_TILES_POPULAR_SITES_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 18 matching lines @@
 class PrefRegistrySyncable;
 }
 
 namespace variations {
 class VariationsService;
 }
 
 class PrefService;
 class TemplateURLService;
 
+namespace ntp_tiles {
+
 // Downloads and provides a list of suggested popular sites, for display on
 // the NTP when there are not enough personalized suggestions. Caches the
 // downloaded file on disk to avoid re-downloading on every startup.
 class PopularSites : public net::URLFetcherDelegate {
  public:
   struct Site {
     Site(const base::string16& title,
          const GURL& url,
          const GURL& favicon_url,
          const GURL& large_icon_url,
@@ skipping 94 matching lines @@
   PrefService* prefs_;
   net::URLRequestContextGetter* download_context_;
 
   scoped_refptr<base::TaskRunner> blocking_runner_;
 
   base::WeakPtrFactory<PopularSites> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PopularSites);
 };
 
+}  // namespace ntp_tiles
+
 #endif  // COMPONENTS_NTP_TILES_POPULAR_SITES_H_