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

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 62686c60dfb5e3458547ad0a388a02e017cb6d9a..52ff30d8df36a778eef41a659ac93f4d328fd0f7 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -513,7 +513,6 @@ const FeatureEntry::Choice kNtpSwitchToExistingTabChoices[] = {
 #endif  // defined(OS_ANDROID)
 
 #if defined(OS_ANDROID)
-const FeatureEntry::FeatureParam kNTPSnippetsFeatureVariationDefault[] = {};
 const FeatureEntry::FeatureParam kNTPSnippetsFeatureVariationOnlyPersonal[] = {
     {"fetching_personalization", "personal"},
     {"fetching_host_restrict", "off"},
@@ -529,10 +528,7 @@ const FeatureEntry::FeatureParam
         {"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",