Upstream various ios/web utilities and helpers

ios/web/navigation/nscoder_util.mm

+// 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 <string>
+
+#include "ios/web/navigation/nscoder_util.h"
+
+namespace web {
+namespace nscoder_util {
+
+void EncodeString(NSCoder* coder, NSString* key, const std::string& string) {
+  [coder encodeBytes:reinterpret_cast<const uint8_t*>(string.data())
+              length:string.size()
+              forKey:key];
+}
+
+std::string DecodeString(NSCoder* decoder, NSString* key) {
+  NSUInteger length;

[Eugene But (OOO till 7-30), 2015/03/09 16:17:43]

NIT: initialize

+  const uint8_t* bytes = [decoder decodeBytesForKey:key returnedLength:&length];
+  return std::string(reinterpret_cast<const char*>(bytes), length);
+}
+
+}  // namespace nscoder_util
+}  // namespace web