Revert of Add Store+Sync to reading list.

ios/chrome/browser/reading_list/reading_list_model_storage_defaults.h

Index: ios/chrome/browser/reading_list/reading_list_model_storage_defaults.h
diff --git a/ios/chrome/browser/reading_list/reading_list_model_storage_defaults.h b/ios/chrome/browser/reading_list/reading_list_model_storage_defaults.h
new file mode 100644
index 0000000000000000000000000000000000000000..e989bd1f68f899d51cbbd9a6b777f9e4b41fccba
--- /dev/null
+++ b/ios/chrome/browser/reading_list/reading_list_model_storage_defaults.h
@@ -0,0 +1,38 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_STORAGE_DEFAULTS_H_
+#define IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_STORAGE_DEFAULTS_H_
+
+#include "ios/chrome/browser/reading_list/reading_list_entry.h"
+#include "ios/chrome/browser/reading_list/reading_list_model_storage.h"
+
+class ReadingListModel;
+#ifdef __OBJC__
+@class NSUserDefaults;
+#else
+typedef struct objc_object NSUserDefaults;
+#endif
+
+// Implementation of ReadingListModelStorage that stores reading list items in
+// the system user defaults.
+class ReadingListModelStorageDefaults : public ReadingListModelStorage {
+ public:
+  ReadingListModelStorageDefaults();
+  ReadingListModelStorageDefaults(NSUserDefaults* backend);
+  ~ReadingListModelStorageDefaults();
+
+  std::vector<ReadingListEntry> LoadPersistentReadList() override;
+  std::vector<ReadingListEntry> LoadPersistentUnreadList() override;
+
+  void SavePersistentReadList(
+      const std::vector<ReadingListEntry>& read) override;
+  void SavePersistentUnreadList(
+      const std::vector<ReadingListEntry>& unread) override;
+
+ private:
+  NSUserDefaults* backend_;
+};
+
+#endif  // IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_STORAGE_DEFAULTS_H_