[Sync] Move some code into new class JsMutationEventObserver

chrome/browser/sync/js/js_sync_manager_observer.cc

Index: chrome/browser/sync/js/js_sync_manager_observer.cc
diff --git a/chrome/browser/sync/js/js_sync_manager_observer.cc b/chrome/browser/sync/js/js_sync_manager_observer.cc
index 7f4a85ef4a5d7b0706ad05d9c56550ff0522c924..7714f27422a7bc145920411c0620b84d0015e571 100644
--- a/chrome/browser/sync/js/js_sync_manager_observer.cc
+++ b/chrome/browser/sync/js/js_sync_manager_observer.cc
@@ -30,54 +30,6 @@ void JsSyncManagerObserver::SetJsEventHandler(
   event_handler_ = event_handler;
 }
 
-namespace {
-
-// Max number of changes we attempt to convert to values (to avoid
-// running out of memory).
-const size_t kChangeLimit = 300;
-
-}  // namespace
-
-void JsSyncManagerObserver::OnChangesApplied(
-    syncable::ModelType model_type,
-    int64 write_transaction_id,
-    const sync_api::ImmutableChangeRecordList& changes) {
-  if (!event_handler_.IsInitialized()) {
-    return;
-  }
-  DictionaryValue details;
-  details.SetString("modelType", syncable::ModelTypeToString(model_type));
-  details.SetString("writeTransactionId",
-                    base::Int64ToString(write_transaction_id));
-  Value* changes_value = NULL;
-  const size_t changes_size = changes.Get().size();
-  if (changes_size <= kChangeLimit) {
-    ListValue* changes_list = new ListValue();
-    for (sync_api::ChangeRecordList::const_iterator it =
-             changes.Get().begin(); it != changes.Get().end(); ++it) {
-      changes_list->Append(it->ToValue());
-    }
-    changes_value = changes_list;
-  } else {
-    changes_value =
-        Value::CreateStringValue(
-            base::Uint64ToString(static_cast<uint64>(changes_size)) +
-            " changes");
-  }
-  details.Set("changes", changes_value);
-  HandleJsEvent(FROM_HERE, "onChangesApplied", JsEventDetails(&details));
-}
-
-void JsSyncManagerObserver::OnChangesComplete(
-    syncable::ModelType model_type) {
-  if (!event_handler_.IsInitialized()) {
-    return;
-  }
-  DictionaryValue details;
-  details.SetString("modelType", syncable::ModelTypeToString(model_type));
-  HandleJsEvent(FROM_HERE, "onChangesComplete", JsEventDetails(&details));
-}
-
 void JsSyncManagerObserver::OnSyncCycleCompleted(
     const sessions::SyncSessionSnapshot* snapshot) {
   if (!event_handler_.IsInitialized()) {