Don't reset the database when there was an I/O error.

third_party/leveldatabase/env_chromium.h

 // Copyright (c) 2013 The LevelDB Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #ifndef THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_H_
 #define THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 48 matching lines @@
   METHOD_ONLY,
   METHOD_AND_PFE,
   METHOD_AND_ERRNO,
   NONE,
 };
 
 ErrorParsingResult ParseMethodAndError(const char* string,
                                        MethodID* method,
                                        int* error);
 bool IndicatesDiskFull(leveldb::Status status);
+bool IsIOError(leveldb::Status status);
 std::string FilePathToString(const base::FilePath& file_path);
 
 class UMALogger {
  public:
   virtual void RecordErrorAt(MethodID method) const = 0;
   virtual void RecordOSError(MethodID method, int saved_errno) const = 0;
   virtual void RecordOSError(MethodID method,
                              base::PlatformFileError error) const = 0;
 };
 
@@ skipping 116 matching lines @@
     void* arg;
     void (*function)(void*);
   };
   typedef std::deque<BGItem> BGQueue;
   BGQueue queue_;
 };
 
 }  // namespace leveldb_env
 
 #endif