ntp_tiles: Cleanup enum names

components/ntp_tiles/ntp_tile_source.h

-// Copyright 2016 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_NTP_TILE_SOURCE_H_
-#define COMPONENTS_NTP_TILES_NTP_TILE_SOURCE_H_
-
-namespace ntp_tiles {
-
-// The source of an NTP tile.
-// A Java counterpart will be generated for this enum.
-// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.chrome.browser.ntp
-enum class NTPTileSource {
-  // Tile comes from the personal top sites list, based on local history.
-  TOP_SITES,
-  // Tile comes from the suggestions service, based on synced history.
-  SUGGESTIONS_SERVICE,
-  // Tile is regionally popular.
-  POPULAR,
-  // Tile is on a custodian-managed whitelist.
-  WHITELIST,
-
-  LAST = WHITELIST
-};
-
-}  // namespace ntp_tiles
-
-#endif  // COMPONENTS_NTP_TILES_NTP_TILE_SOURCE_H_