arc: Make request to remove Android's data folder persistent.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index d4a75a4a9c1f5d7099287f350142e4b631f1bd45..57c88074d56e6e427e1898553dc6f021c2808da9 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -22,6 +22,8 @@ namespace prefs {
 const char kArcApps[] = "arc.apps";
 // A preference to store backup and restore state for Android apps.
 const char kArcBackupRestoreEnabled[] = "arc.backup_restore.enabled";
+// A preference to indicate that Android's data directory should be removed.
+const char kArcDataRemoveRequested[] = "arc.data.remove_requested";
 // A preference to keep Android apps enabled state.
 const char kArcEnabled[] = "arc.enabled";
 // A preference that indicated whether Android reported that it's compliant