Remove existing day zero UI modifications (#32441)

browser/day_zero_browser_ui_expt/day_zero_browser_ui_expt_manager.cc

@@ -21,14 +21,6 @@
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 
-#if BUILDFLAG(IS_ANDROID)
-#include <string_view>
-
-#include "base/android/jni_android.h"
-#include "base/android/jni_string.h"
-#include "brave/build/android/jni_headers/DayZeroHelper_jni.h"
-#endif  // #BUILDFLAG(IS_ANDROID)
-
 // static
 void DayZeroBrowserUIExptManager::RegisterLocalStatePrefs(
     PrefRegistrySimple* registry) {
@@ -120,12 +112,6 @@ void DayZeroBrowserUIExptManager::OnProfileManagerDestroying() {
 
 void DayZeroBrowserUIExptManager::SetForDayZeroBrowserUI(Profile* profile) {
   VLOG(2) << __func__ << " Update prefs for day zero expt.";
-#if BUILDFLAG(IS_ANDROID)
-  Java_DayZeroHelper_setDayZeroVariant(base::android::AttachCurrentThread(),
-                                       base::android::ConvertUTF8ToJavaString(
-                                           base::android::AttachCurrentThread(),
-                                           GetDayZeroVariant().value_or("")));
-#endif  // #BUILDFLAG(IS_ANDROID)
 }
 
 void DayZeroBrowserUIExptManager::ResetForDayZeroBrowserUI(Profile* profile) {

browser/ui/webui/welcome_page/welcome_dom_handler.cc

@@ -69,10 +69,6 @@ bool IsChromeDev(const std::u16string& browser_name) {
 }
 
 bool ShouldRedirectToGettingStartedPage() {
-  if (base::FeatureList::IsEnabled(features::kBraveDayZeroExperiment) &&
-      features::kBraveDayZeroExperimentVariant.Get() == "c") {
-    return true;
-  }
   return base::FeatureList::IsEnabled(
       brave_education::features::kShowGettingStartedPage);
 }