Bookmark Suggestions: don't use creation date fallback by default

components/ntp_snippets/bookmarks/bookmark_suggestions_provider.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/bookmarks/bookmark_suggestions_provider.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 16 matching lines @@
 #include "ui/gfx/image/image.h"
 
 using bookmarks::BookmarkModel;
 using bookmarks::BookmarkNode;
 
 namespace {
 
 const int kMaxBookmarks = 10;
 const int kMinBookmarks = 3;
 const int kMaxBookmarkAgeInDays = 42;
-const int kUseCreationDateFallbackForDays = 42;
+const int kUseCreationDateFallbackForDays = 0;
 
 const char* kMaxBookmarksParamName = "bookmarks_max_count";
 const char* kMinBookmarksParamName = "bookmarks_min_count";
 const char* kMaxBookmarkAgeInDaysParamName = "bookmarks_max_age_in_days";
 const char* kUseCreationDateFallbackForDaysParamName =
     "bookmarks_creation_date_fallback_days";
 const char* kShowIfEmptyParamName = "bookmarks_show_if_empty";
 
 base::Time GetThresholdTime() {
   std::string age_in_days_string = variations::GetVariationParamValueByFeature(
@@ skipping 255 matching lines @@
 
 void BookmarkSuggestionsProvider::NotifyStatusChanged(
     CategoryStatus new_status) {
   if (category_status_ == new_status)
     return;
   category_status_ = new_status;
   observer()->OnCategoryStatusChanged(this, provided_category_, new_status);
 }
 
 }  // namespace ntp_snippets