Update from https://crrev.com/333737

base/prefs/overlay_user_pref_store.cc

Index: base/prefs/overlay_user_pref_store.cc
diff --git a/base/prefs/overlay_user_pref_store.cc b/base/prefs/overlay_user_pref_store.cc
index e93dffd961a9088178d3247ad90417d4bbe11916..4c236f10dd0da84240d1e790c26099f9160756e2 100644
--- a/base/prefs/overlay_user_pref_store.cc
+++ b/base/prefs/overlay_user_pref_store.cc
@@ -121,6 +121,10 @@ void OverlayUserPrefStore::CommitPendingWrite() {
   // We do not write our content intentionally.
 }
 
+void OverlayUserPrefStore::SchedulePendingLossyWrites() {
+  underlay_->SchedulePendingLossyWrites();
+}
+
 void OverlayUserPrefStore::ReportValueChanged(const std::string& key,
                                               uint32 flags) {
   FOR_EACH_OBSERVER(PrefStore::Observer, observers_, OnPrefValueChanged(key));