[NTP] Create standard pref migration for "hide_all_widgets" pref (#34940)

browser/brave_profile_prefs.cc

@@ -382,6 +382,9 @@ void RegisterProfilePrefsForMigration(
   // Added 2026-03
   registry->RegisterDictionaryPref(
       serp_metrics::prefs::kDeprecatedSerpMetricsTimePeriodStorage);
+
+  // Added 2026-03
+  registry->RegisterBooleanPref(kNewTabPageHideAllWidgets, false);
 }
 
 void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
@@ -466,7 +469,6 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterStringPref(kNewTabPageClockFormat, "");
   registry->RegisterBooleanPref(kNewTabPageShowStats, true);
   registry->RegisterBooleanPref(kNewTabPageShowRewards, true);
-  registry->RegisterBooleanPref(kNewTabPageHideAllWidgets, false);
 
 #if BUILDFLAG(ENABLE_BRAVE_TALK)
   registry->RegisterBooleanPref(brave_talk::prefs::kNewTabPageShowBraveTalk,

browser/ui/webui/brave_new_tab_page_refresh/new_tab_page_initializer.cc

@@ -121,7 +121,6 @@ void NewTabPageInitializer::Initialize() {
   AddFaviconDataSource();
   AddCustomImageDataSource();
   AddSanitizedImageDataSource();
-  MaybeMigrateHideAllWidgetsPref();
 
   web_ui_->AddRequestableScheme(content::kChromeUIUntrustedScheme);
   web_ui_->OverrideTitle(l10n_util::GetStringUTF16(IDS_NEW_TAB_TITLE));
@@ -268,25 +267,4 @@ void NewTabPageInitializer::AddSanitizedImageDataSource() {
       profile, std::make_unique<BraveSanitizedImageSource>(profile));
 }
 
-void NewTabPageInitializer::MaybeMigrateHideAllWidgetsPref() {
-  // The "hide all widgets" toggle does not exist on this version of the NTP.
-  // If the user has enabled this pref, hide the individual widgets affected by
-  // that pref.
-  // TODO(https://github.com/brave/brave-browser/issues/49544): Deprecate the
-  // `kNewTabPageHideAllWidgets` pref and perform the migration in
-  // `MigrateObsoleteProfilePrefs`.
-  auto* prefs = GetProfile()->GetPrefs();
-  if (prefs->GetBoolean(kNewTabPageHideAllWidgets)) {
-    prefs->SetBoolean(kNewTabPageHideAllWidgets, false);
-
-    prefs->SetBoolean(kNewTabPageShowRewards, false);
-#if BUILDFLAG(ENABLE_BRAVE_TALK)
-    prefs->SetBoolean(brave_talk::prefs::kNewTabPageShowBraveTalk, false);
-#endif
-#if BUILDFLAG(ENABLE_BRAVE_VPN)
-    prefs->SetBoolean(kNewTabPageShowBraveVPN, false);
-#endif
-  }
-}
-
 }  // namespace brave_new_tab_page_refresh

browser/ui/webui/brave_new_tab_page_refresh/new_tab_page_initializer.h

@@ -52,7 +52,6 @@ class NewTabPageInitializer {
   void AddFaviconDataSource();
   void AddCustomImageDataSource();
   void AddSanitizedImageDataSource();
-  void MaybeMigrateHideAllWidgetsPref();
 
   raw_ref<content::WebUI> web_ui_;
   raw_ptr<content::WebUIDataSource> source_ = nullptr;

chromium_src/chrome/browser/prefs/DEPS

@@ -13,6 +13,8 @@ include_rules = [
   "+brave/components/brave_shields/content/browser/ad_block_service.h",
   "+brave/components/brave_shields/core/browser/brave_shields_p3a.h",
   "+brave/components/brave_sync/brave_sync_prefs.h",
+  "+brave/components/brave_talk/buildflags/buildflags.h",
+  "+brave/components/brave_talk/pref_names.h",
   "+brave/components/brave_vpn/common/buildflags/buildflags.h",
   "+brave/components/brave_wallet/browser/pref_names.h",
   "+brave/components/brave_wallet/browser/keyring_service.h",

chromium_src/chrome/browser/prefs/browser_prefs.cc

@@ -18,6 +18,7 @@
 #include "brave/components/brave_shields/content/browser/ad_block_service.h"
 #include "brave/components/brave_shields/core/browser/brave_shields_p3a.h"
 #include "brave/components/brave_sync/brave_sync_prefs.h"
+#include "brave/components/brave_talk/buildflags/buildflags.h"
 #include "brave/components/brave_vpn/common/buildflags/buildflags.h"
 #include "brave/components/brave_wallet/common/buildflags/buildflags.h"
 #include "brave/components/constants/pref_names.h"
@@ -58,6 +59,10 @@
 #include "brave/browser/brave_rewards/rewards_prefs_util.h"
 #endif
 
+#if BUILDFLAG(ENABLE_BRAVE_TALK)
+#include "brave/components/brave_talk/pref_names.h"
+#endif
+
 #if !BUILDFLAG(IS_ANDROID)
 #include "brave/browser/ui/tabs/brave_tab_prefs.h"
 #include "brave/browser/ui/webui/welcome_page/brave_welcome_ui_prefs.h"
@@ -254,6 +259,20 @@ void MigrateObsoleteProfilePrefs(PrefService* profile_prefs,
   speedreader::MigrateObsoleteProfilePrefs(profile_prefs);
 #endif
 
+  // Added 2026-03
+  if (profile_prefs->GetBoolean(kNewTabPageHideAllWidgets)) {
+    profile_prefs->SetBoolean(kNewTabPageHideAllWidgets, false);
+    profile_prefs->SetBoolean(kNewTabPageShowRewards, false);
+#if BUILDFLAG(ENABLE_BRAVE_TALK)
+    profile_prefs->SetBoolean(brave_talk::prefs::kNewTabPageShowBraveTalk,
+                              false);
+#endif
+#if BUILDFLAG(ENABLE_BRAVE_VPN)
+    profile_prefs->SetBoolean(kNewTabPageShowBraveVPN, false);
+#endif
+  }
+  profile_prefs->ClearPref(kNewTabPageHideAllWidgets);
+
   // END_MIGRATE_OBSOLETE_PROFILE_PREFS
 }