Remove old webui History page on desktop and mobile

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index f187d41fe110d084856440dd281539177e7e865c..fd1268d66fa9188a1d398dd5186ffaaf12447b8c 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -309,10 +309,6 @@ const base::Feature kSendBeaconThrowForBlobWithNonSimpleType{
 const base::Feature kAndroidAutofillAccessibility{
     "AndroidAutofillAccessibility", base::FEATURE_DISABLED_BY_DEFAULT};
 
-// A browsing history manager implementation for Android.
-const base::Feature kNativeAndroidHistoryManager{
-  "AndroidHistoryManager", base::FEATURE_DISABLED_BY_DEFAULT};
-
 // FeatureList definition for the Seccomp field trial.
 const base::Feature kSeccompSandboxAndroid{"SeccompSandboxAndroid",
                                            base::FEATURE_ENABLED_BY_DEFAULT};