Remove unused pre-material NTP styling.

chrome/browser/android/chrome_feature_list.cc

Index: chrome/browser/android/chrome_feature_list.cc
diff --git a/chrome/browser/android/chrome_feature_list.cc b/chrome/browser/android/chrome_feature_list.cc
index 60443cf24aa954299a8c79e34b85767c61635241..c340f74566a2e3547647b4b9a18dc32d976feb4f 100644
--- a/chrome/browser/android/chrome_feature_list.cc
+++ b/chrome/browser/android/chrome_feature_list.cc
@@ -42,7 +42,6 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &ntp_snippets::kContentSuggestionsFeature,
     &ntp_snippets::kSaveToOfflineFeature,
     &kNTPFakeOmniboxTextFeature,
-    &kNTPMaterialDesign,
     &kNTPOfflinePagesFeature,
     &kPhysicalWebFeature,
     &kPhysicalWebIgnoreOtherClientsFeature,
@@ -69,9 +68,6 @@ const base::Feature kDownloadsUiFeature{"DownloadsUi",
 const base::Feature kImportantSitesInCBD{"ImportantSitesInCBD",
                                          base::FEATURE_DISABLED_BY_DEFAULT};
 
-const base::Feature kNTPMaterialDesign{"NTPMaterialDesign",
-                                       base::FEATURE_ENABLED_BY_DEFAULT};
-
 const base::Feature kNTPOfflinePagesFeature{"NTPOfflinePages",
                                             base::FEATURE_DISABLED_BY_DEFAULT};