Clean-up the code for default variations in chrome://flags.

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 495 matching lines @@
     {IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kNtpSwitchToExistingTab,
      "disabled"},
     {IDS_FLAGS_NTP_SWITCH_TO_EXISTING_TAB_MATCH_URL,
      switches::kNtpSwitchToExistingTab, "url"},
     {IDS_FLAGS_NTP_SWITCH_TO_EXISTING_TAB_MATCH_HOST,
      switches::kNtpSwitchToExistingTab, "host"},
 };
 #endif  // defined(OS_ANDROID)
 
 #if defined(OS_ANDROID)
-const FeatureEntry::FeatureParam kNTPSnippetsFeatureVariationDefault[] = {};
 const FeatureEntry::FeatureParam kNTPSnippetsFeatureVariationOnlyPersonal[] = {
     {"fetching_personalization", "personal"},
     {"fetching_host_restrict", "off"},
 };
 const FeatureEntry::FeatureParam
     kNTPSnippetsFeatureVariationOnlyNonPersonalHostRestricted[] = {
         {"fetching_personalization", "non_personal"},
         {"fetching_host_restrict", "on"},
 };
 const FeatureEntry::FeatureParam
     kNTPSnippetsFeatureVariationOnlyPersonalHostRestricted[] = {
         {"fetching_personalization", "personal"},
         {"fetching_host_restrict", "on"},
 };
 
-// TODO(jkrcal) allow for nullptr instead of the empty array.
 const FeatureEntry::FeatureVariation kNTPSnippetsFeatureVariations[] = {
-    {"", kNTPSnippetsFeatureVariationDefault,
-     0},
     {"only personalized", kNTPSnippetsFeatureVariationOnlyPersonal,
      arraysize(kNTPSnippetsFeatureVariationOnlyPersonal)},
     {"only from most visited sites",
      kNTPSnippetsFeatureVariationOnlyNonPersonalHostRestricted,
      arraysize(kNTPSnippetsFeatureVariationOnlyPersonal)},
     {"only personalized from most visited sites",
      kNTPSnippetsFeatureVariationOnlyPersonalHostRestricted,
      arraysize(kNTPSnippetsFeatureVariationOnlyPersonalHostRestricted)},
 };
 #endif  // defined(OS_ANDROID)
@@ skipping 1617 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags