Delete the PreferenceMACs on profile deletion.

components/prefs/testing_pref_store.h

 // Copyright (c) 2012 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_PREFS_TESTING_PREF_STORE_H_
 #define COMPONENTS_PREFS_TESTING_PREF_STORE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 53 matching lines @@
   bool GetInteger(const std::string& key, int* value) const;
   bool GetBoolean(const std::string& key, bool* value) const;
 
   // Determines whether ReadPrefsAsync completes immediately. Defaults to false
   // (non-blocking). To block, invoke this with true (blocking) before the call
   // to ReadPrefsAsync. To unblock, invoke again with false (non-blocking) after
   // the call to ReadPrefsAsync.
   void SetBlockAsyncRead(bool block_async_read);
 
   void ClearMutableValues() override;
+  void OnStoreDeletionFromDisk() override;
 
   // Getter and Setter methods for setting and getting the state of the
   // |TestingPrefStore|.
   virtual void set_read_only(bool read_only);
   void set_read_success(bool read_success);
   void set_read_error(PersistentPrefStore::PrefReadError read_error);
   bool committed() { return committed_; }
 
  protected:
   ~TestingPrefStore() override;
@@ skipping 27 matching lines @@
   // mutation.
   bool committed_;
 
   std::unique_ptr<ReadErrorDelegate> error_delegate_;
   base::ObserverList<PrefStore::Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TestingPrefStore);
 };
 
 #endif  // COMPONENTS_PREFS_TESTING_PREF_STORE_H_