Enable Home Page tile by default for Chrome Home.

components/ntp_tiles/constants.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_CONSTANTS_H_
 #define COMPONENTS_NTP_TILES_CONSTANTS_H_
 
 namespace base {
 struct Feature;
 }  // namespace base
 
 namespace ntp_tiles {
 
 // Name of the field trial to configure PopularSites.
 extern const char kPopularSitesFieldTrialName[];
 
 // This feature is enabled by default. Otherwise, users who need it would not
 // get the right configuration timely enough. The configuration affects only
 // Android or iOS users.
 extern const base::Feature kPopularSitesBakedInContentFeature;
 
 // Feature to allow the new Google favicon server for fetching favicons for Most
 // Likely tiles on the New Tab Page.
 extern const base::Feature kNtpMostLikelyFaviconsFromServerFeature;
 
-// Feature to pin any set home page as first tile.
-extern const base::Feature kPinHomePageAsTileFeature;
-
 // Use this to find out whether the kNtpMostLikelyFaviconsFromServerFeature is
 // enabled. This helper function abstracts iOS special way to override the
 // feature (via command-line params).
 // TODO(jkrcal): Remove once crbug.com/718926 is fixed.
 bool AreNtpMostLikelyFaviconsFromServerEnabled();
 
 }  // namespace ntp_tiles
 
 #endif  // COMPONENTS_NTP_TILES_CONSTANTS_H_