Eliminate all code related to the AutomaticProfileResetter.

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 71fcc2bb3e34abd8708d33cd6176f5e9eb682aaa..72dab2c3833d9677a36ab2a9c18103be691fa881 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -136,7 +136,6 @@
 #include "chrome/browser/android/new_tab_page_prefs.h"
 #else
 #include "chrome/browser/notifications/sync_notifier/chrome_notifier_service.h"
-#include "chrome/browser/profile_resetter/automatic_profile_resetter_factory.h"
 #include "chrome/browser/ui/autofill/generated_credit_card_bubble_controller.h"
 #endif
 
@@ -221,6 +220,12 @@ const char kBackupPref[] = "backup";
 // The sync promo error message preference has been removed; this pref will
 // be cleared from user data.
 const char kSyncPromoErrorMessage[] = "sync_promo.error_message";
+
+// The AutomaticProfileResetter service, which has since been unimplemented,
+// used this preference to save that the profile reset prompt had already been
+// shown. We keep the name here for now so that we can clear out legacy values.
+// TODO(engedy): Remove this and usages in M42 or later. See crbug.com/398813.
+const char kProfileResetPromptMemento[] = "profile.reset_prompt_memento";
 #endif
 
 }  // namespace
@@ -286,7 +291,6 @@ void RegisterLocalState(PrefRegistrySimple* registry) {
 #endif  // defined(ENABLE_TASK_MANAGER)
 
 #if !defined(OS_ANDROID)
-  AutomaticProfileResetterFactory::RegisterPrefs(registry);
   BackgroundModeManager::RegisterPrefs(registry);
   RegisterBrowserPrefs(registry);
 #if !defined(OS_CHROMEOS)
@@ -343,6 +347,12 @@ void RegisterLocalState(PrefRegistrySimple* registry) {
 #if defined(TOOLKIT_VIEWS)
   RegisterBrowserViewLocalPrefs(registry);
 #endif
+
+  // Preferences registered only for migration (clearing or moving to a new key)
+  // go here.
+#if !defined(OS_ANDROID)
+  registry->RegisterDictionaryPref(kProfileResetPromptMemento);
+#endif  // !defined(OS_ANDROID)
 }
 
 // Register prefs applicable to all profiles.
@@ -476,8 +486,8 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   ash::RegisterChromeLauncherUserPrefs(registry);
 #endif
 
-  // Prefs registered only for migration (clearing or moving to a new
-  // key) go here.
+  // Preferences registered only for migration (clearing or moving to a new key)
+  // go here.
   registry->RegisterDictionaryPref(
       kBackupPref,
       new base::DictionaryValue(),
@@ -590,6 +600,10 @@ void MigrateBrowserPrefs(Profile* profile, PrefService* local_state) {
                             current_version);
   }
 
+#if !defined(OS_ANDROID)
+  local_state->ClearPref(kProfileResetPromptMemento);
+#endif
+
 #if defined(OS_CHROMEOS)
   chromeos::default_pinned_apps_field_trial::MigratePrefs(local_state);
 #endif