Provide lazy CommitPendingWrites in addition to eager SavePersistentPrefs.

chrome/common/json_pref_store.cc

Index: chrome/common/json_pref_store.cc
diff --git a/chrome/common/json_pref_store.cc b/chrome/common/json_pref_store.cc
index b6e76c9670bd84fce931fd3bdb929ed565f4c132..c7ce0810b7804ed9626d22b5c486f0d71346fa23 100644
--- a/chrome/common/json_pref_store.cc
+++ b/chrome/common/json_pref_store.cc
@@ -26,8 +26,7 @@ JsonPrefStore::JsonPrefStore(const FilePath& filename,
 }
 
 JsonPrefStore::~JsonPrefStore() {
-  if (writer_.HasPendingWrite() && !read_only_)
-    writer_.DoScheduledWrite();
+  CommitPendingWrites();
 }
 
 PrefStore::ReadResult JsonPrefStore::GetValue(const std::string& key,
@@ -159,6 +158,11 @@ void JsonPrefStore::ScheduleWritePrefs() {
   writer_.ScheduleWrite(this);
 }
 
+void JsonPrefStore::CommitPendingWrites() {
+  if (writer_.HasPendingWrite() && !read_only_)
+    writer_.DoScheduledWrite();
+}
+
 void JsonPrefStore::ReportValueChanged(const std::string& key) {
   FOR_EACH_OBSERVER(PrefStore::Observer, observers_, OnPrefValueChanged(key));
 }