Invoke the StartSyncFlare for prefs when performing an automatic reset.

chrome/browser/prefs/pref_hash_filter.cc

Index: chrome/browser/prefs/pref_hash_filter.cc
diff --git a/chrome/browser/prefs/pref_hash_filter.cc b/chrome/browser/prefs/pref_hash_filter.cc
index 8bdf99444065a662e03baf3479fdd0c8c586ea5b..ef6dd4ad7a3f80b02ce9d787f16267ecf5ed5144 100644
--- a/chrome/browser/prefs/pref_hash_filter.cc
+++ b/chrome/browser/prefs/pref_hash_filter.cc
@@ -24,10 +24,12 @@
 PrefHashFilter::PrefHashFilter(
     scoped_ptr<PrefHashStore> pref_hash_store,
     const std::vector<TrackedPreferenceMetadata>& tracked_preferences,
+    const base::Closure& on_reset,
     TrackedPreferenceValidationDelegate* delegate,
     size_t reporting_ids_count,
     bool report_super_mac_validity)
     : pref_hash_store_(pref_hash_store.Pass()),
+      on_reset_(on_reset),
       report_super_mac_validity_(report_super_mac_validity) {
   DCHECK(pref_hash_store_);
   DCHECK_GE(reporting_ids_count, tracked_preferences.size());
@@ -185,6 +187,9 @@ void PrefHashFilter::FinalizeFilterOnLoad(
                              new base::StringValue(base::Int64ToString(
                                  base::Time::Now().ToInternalValue())));
     FilterUpdate(prefs::kPreferenceResetTime);
+
+    if (!on_reset_.is_null())
+      on_reset_.Run();
   }
 
   // TODO(gab): Remove this histogram by Feb 21 2014; after sufficient timing