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

third_party/leveldatabase/env_chromium.cc

 // Copyright (c) 2011 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.
 
 #include <errno.h>
 #include <stdio.h>
 
 #include <deque>
 
 #include "base/at_exit.h"
@@ skipping 374 matching lines @@
   leveldb_env::MethodID method;
   int error = -1;
   leveldb_env::ErrorParsingResult result = leveldb_env::ParseMethodAndError(
       status.ToString().c_str(), &method, &error);
   return (result == leveldb_env::METHOD_AND_PFE &&
           static_cast<base::PlatformFileError>(error) ==
               base::PLATFORM_FILE_ERROR_NO_SPACE) ||
          (result == leveldb_env::METHOD_AND_ERRNO && error == ENOSPC);
 }
 
+bool IsIOError(leveldb::Status status) {
+  leveldb_env::MethodID method;
+  int error = -1;
+  leveldb_env::ErrorParsingResult result = leveldb_env::ParseMethodAndError(
+      status.ToString().c_str(), &method, &error);
+  return result != leveldb_env::NONE;
+}
+
 std::string FilePathToString(const base::FilePath& file_path) {
 #if defined(OS_WIN)
   return UTF16ToUTF8(file_path.value());
 #else
   return file_path.value();
 #endif
 }
 
 ChromiumWritableFile::ChromiumWritableFile(const std::string& fname,
                                            FILE* f,
@@ skipping 533 matching lines @@
 Env* IDBEnv() {
   return leveldb_env::idb_env.Pointer();
 }
 
 Env* Env::Default() {
   return leveldb_env::default_env.Pointer();
 }
 
 }  // namespace leveldb