Remove all ReadingList entries on managed account signout.

components/reading_list/ios/reading_list_model.h

 // 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 COMPONENTS_READING_LIST_IOS_READING_LIST_MODEL_H_
 #define COMPONENTS_READING_LIST_IOS_READING_LIST_MODEL_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 51 matching lines @@
   // Returns the total number of unread entries in the model.
   virtual size_t unread_size() const = 0;
 
   // Returns the total number of unseen entries in the model. Note: These
   // entries are also unread so unseen_size() <= unread_size().
   virtual size_t unseen_size() const = 0;
 
   // Mark all unseen entries as unread.
   virtual void MarkAllSeen() = 0;
 
+  // Delete all the Reading List entries. Return true if entries where indeed
+  // deleted.
+  virtual bool DeleteAllEntries() = 0;
+
   // Returns the flag about unseen entries on the device.
   // This flag is raised if some unseen items are added on this device.
   // The flag is reset if |ResetLocalUnseenFlag| is called or if all unseen
   // entries are removed.
   // This is a local flag and it can have different values on different devices,
   // even if they are synced.
   // (unseen_size() == 0 => GetLocalUnseenFlag() == false)
   virtual bool GetLocalUnseenFlag() const = 0;
 
   // Set the unseen flag to false.
@@ skipping 80 matching lines @@
   // Called when model is leaving batch update mode.
   virtual void LeavingBatchUpdates();
 
  private:
   unsigned int current_batch_updates_count_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListModel);
 };
 
 #endif  // COMPONENTS_READING_LIST_IOS_READING_LIST_MODEL_H_