Validate that paths don't contain embedded NULLs at deserialization.

BUG=166867

Review URL: https://chromiumcodereview.appspot.com/11743009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@174935 0039d316-1c4b-4281-b951-d872f2087c98
void ParamTraits<DictionaryValue>::Log(const param_type& p, std::string* l) {
  std::string json;
  base::JSONWriter::Write(&p, &json);
  l->append(json);
}

void ParamTraits<DictionaryValue>::Log(const param_type& p, std::string* l) {
  std::string json;
  base::JSONWriter::Write(&p, &json);
  l->append(json);
}
