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<std::vector<unsigned char> >::Write(Message* m,
                                                     const param_type& p) {
  if (p.empty()) {
    m->WriteData(NULL, 0);
  } else {
    m->WriteData(reinterpret_cast<const char*>(&p.front()),
                 static_cast<int>(p.size()));
  }
}

void ParamTraits<std::vector<unsigned char> >::Write(Message* m,
                                                     const param_type& p) {
  if (p.empty()) {
    m->WriteData(NULL, 0);
  } else {
    m->WriteData(reinterpret_cast<const char*>(&p.front()),
                 static_cast<int>(p.size()));
  }
}
