Fixes for re-enabling more MSVC level 4 warnings: content/browser/ edition

content/browser/indexed_db/indexed_db_leveldb_coding.cc

 // Copyright (c) 2013 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 "content/browser/indexed_db/indexed_db_leveldb_coding.h"
 
 #include <iterator>
 #include <limits>
 
 #include "base/logging.h"
@@ skipping 1418 matching lines @@
 
 std::string DatabaseMetaDataKey::Encode(int64 database_id,
                                         MetaDataType meta_data_type) {
   KeyPrefix prefix(database_id);
   std::string ret = prefix.Encode();
   ret.push_back(meta_data_type);
   return ret;
 }
 
 ObjectStoreMetaDataKey::ObjectStoreMetaDataKey()
-    : object_store_id_(-1), meta_data_type_(-1) {}
+    : object_store_id_(-1), meta_data_type_(0xFF) {}
 
 bool ObjectStoreMetaDataKey::Decode(StringPiece* slice,
                                     ObjectStoreMetaDataKey* result) {
   KeyPrefix prefix;
   if (!KeyPrefix::Decode(slice, &prefix))
     return false;
   DCHECK(prefix.database_id_);
   DCHECK(!prefix.object_store_id_);
   DCHECK(!prefix.index_id_);
   unsigned char type_byte = 0;
@@ skipping 580 matching lines @@
 scoped_ptr<IndexedDBKey> IndexDataKey::primary_key() const {
   scoped_ptr<IndexedDBKey> key;
   StringPiece slice(encoded_primary_key_);
   if (!DecodeIDBKey(&slice, &key)) {
     // TODO(jsbell): Return error.
   }
   return key.Pass();
 }
 
 }  // namespace content