Revert 272671 "Implementation of leveldb-backed PrefStore."

trunk/src/base/prefs/json_pref_store.cc

 // 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.
 
 #include "base/prefs/json_pref_store.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 312 matching lines @@
         break;
       case PREF_READ_ERROR_JSON_PARSE:
       case PREF_READ_ERROR_JSON_REPEAT:
         break;
       case PREF_READ_ERROR_ASYNCHRONOUS_TASK_INCOMPLETE:
         // This is a special error code to be returned by ReadPrefs when it
         // can't complete synchronously, it should never be returned by the read
         // operation itself.
         NOTREACHED();
         break;
-      case PREF_READ_ERROR_LEVELDB_IO:
-      case PREF_READ_ERROR_LEVELDB_CORRUPTION_READ_ONLY:
-      case PREF_READ_ERROR_LEVELDB_CORRUPTION:
-        // These are specific to LevelDBPrefStore.
-        NOTREACHED();
       case PREF_READ_ERROR_MAX_ENUM:
         NOTREACHED();
         break;
     }
   }
 
   if (pref_filter_) {
     filtering_in_progress_ = true;
     const PrefFilter::PostFilterOnLoadCallback post_filter_on_load_callback(
         base::Bind(
@@ skipping 39 matching lines @@
 
   if (error_delegate_ && read_error_ != PREF_READ_ERROR_NONE)
     error_delegate_->OnError(read_error_);
 
   FOR_EACH_OBSERVER(PrefStore::Observer,
                     observers_,
                     OnInitializationCompleted(true));
 
   return;
 }