Delete the NTPPreferAmpUrls feature flag.

components/ntp_snippets/features.cc

 // 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.
 
 #include "components/ntp_snippets/features.h"
 
 #include "base/feature_list.h"
 #include "base/memory/ptr_util.h"
 #include "base/time/clock.h"
 #include "components/ntp_snippets/category_rankers/click_based_category_ranker.h"
 #include "components/ntp_snippets/category_rankers/constant_category_ranker.h"
 #include "components/variations/variations_associated_data.h"
 
 namespace ntp_snippets {
 
 // Keep sorted, and keep nullptr at the end.
 const base::Feature*(kAllFeatures[]) = {&kArticleSuggestionsFeature,
                                         &kBookmarkSuggestionsFeature,
                                         &kCategoryOrder,
                                         &kCategoryRanker,
                                         &kContentSuggestionsPushFeature,
                                         &kForeignSessionsSuggestionsFeature,
                                         &kIncreasedVisibility,
                                         &kNotificationsFeature,
                                         &kPhysicalWebPageSuggestionsFeature,
-                                        &kPreferAmpUrlsFeature,
                                         &kPublisherFaviconsFromNewServerFeature,
                                         &kRecentOfflineTabSuggestionsFeature,
                                         nullptr};
 
 const base::Feature kArticleSuggestionsFeature{
     "NTPArticleSuggestions", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kBookmarkSuggestionsFeature{
     "NTPBookmarkSuggestions", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kRecentOfflineTabSuggestionsFeature{
     "NTPOfflinePageSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kIncreasedVisibility{"NTPSnippetsIncreasedVisibility",
                                          base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kPhysicalWebPageSuggestionsFeature{
     "NTPPhysicalWebPageSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kForeignSessionsSuggestionsFeature{
     "NTPForeignSessionsSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kContentSuggestionsPushFeature{
     "ContentSuggestionsPush", base::FEATURE_DISABLED_BY_DEFAULT};
 
-const base::Feature kPreferAmpUrlsFeature{"NTPPreferAmpUrls",
-                                          base::FEATURE_ENABLED_BY_DEFAULT};
-
 const base::Feature kCategoryRanker{"ContentSuggestionsCategoryRanker",
                                     base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kPublisherFaviconsFromNewServerFeature{
     "ContentSuggestionsFaviconsFromNewServer",
     base::FEATURE_DISABLED_BY_DEFAULT};
 
 const char kCategoryRankerParameter[] = "category_ranker";
 const char kCategoryRankerConstantRanker[] = "constant";
 const char kCategoryRankerClickBasedRanker[] = "click_based";
@@ skipping 74 matching lines @@
 const char kNotificationsTextValuePublisher[] = "publisher";
 const char kNotificationsTextValueSnippet[] = "snippet";
 const char kNotificationsTextValueAndMore[] = "and_more";
 const char kNotificationsKeepWhenFrontmostParam[] =
     "keep_notification_when_frontmost";
 const char kNotificationsOpenToNTPParam[] = "open_to_ntp";
 const char kNotificationsDailyLimit[] = "daily_limit";
 const char kNotificationsIgnoredLimitParam[] = "ignored_limit";
 
 }  // namespace ntp_snippets