Revert 272671 "Implementation of leveldb-backed PrefStore."

trunk/src/base/prefs/persistent_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 BASE_PREFS_PERSISTENT_PREF_STORE_H_
 #define BASE_PREFS_PERSISTENT_PREF_STORE_H_
 
 #include <string>
 
 #include "base/prefs/base_prefs_export.h"
@@ skipping 15 matching lines @@
     PREF_READ_ERROR_ACCESS_DENIED = 3,
     PREF_READ_ERROR_FILE_OTHER = 4,
     PREF_READ_ERROR_FILE_LOCKED = 5,
     PREF_READ_ERROR_NO_FILE = 6,
     PREF_READ_ERROR_JSON_REPEAT = 7,
     // PREF_READ_ERROR_OTHER = 8,  // Deprecated.
     PREF_READ_ERROR_FILE_NOT_SPECIFIED = 9,
     // Indicates that ReadPrefs() couldn't complete synchronously and is waiting
     // for an asynchronous task to complete first.
     PREF_READ_ERROR_ASYNCHRONOUS_TASK_INCOMPLETE = 10,
-    PREF_READ_ERROR_LEVELDB_IO = 11,
-    PREF_READ_ERROR_LEVELDB_CORRUPTION_READ_ONLY = 12,
-    PREF_READ_ERROR_LEVELDB_CORRUPTION = 13,
     PREF_READ_ERROR_MAX_ENUM
   };
 
   class ReadErrorDelegate {
    public:
     virtual ~ReadErrorDelegate() {}
 
     virtual void OnError(PrefReadError error) = 0;
   };
 
@@ skipping 32 matching lines @@
   virtual void ReadPrefsAsync(ReadErrorDelegate* error_delegate) = 0;
 
   // Lands any pending writes to disk.
   virtual void CommitPendingWrite() = 0;
 
  protected:
   virtual ~PersistentPrefStore() {}
 };
 
 #endif  // BASE_PREFS_PERSISTENT_PREF_STORE_H_