Avoid large inlined automatic methods in IndexedDB code.

content/browser/indexed_db/indexed_db_value.cc

 // Copyright 2014 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_value.h"
 
 #include "base/logging.h"
 
 namespace content {
 
-IndexedDBValue::IndexedDBValue() {}
+IndexedDBValue::IndexedDBValue() = default;
 IndexedDBValue::IndexedDBValue(
     const std::string& input_bits,
     const std::vector<IndexedDBBlobInfo>& input_blob_info)
     : bits(input_bits), blob_info(input_blob_info) {
   DCHECK(!input_blob_info.size() || input_bits.size());
 }
-IndexedDBValue::~IndexedDBValue() {}
+IndexedDBValue::IndexedDBValue(const IndexedDBValue& other) = default;
+IndexedDBValue::~IndexedDBValue() = default;
+IndexedDBValue& IndexedDBValue::operator=(const IndexedDBValue& other) =
+    default;
 
 }  // namespace content