Remove all blimp client code.

blimp/client/public/session/assignment.cc

-// Copyright 2016 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 "blimp/client/public/session/assignment.h"
-
-#include "net/cert/x509_certificate.h"
-
-namespace blimp {
-namespace client {
-
-Assignment::Assignment() : transport_protocol(TransportProtocol::UNKNOWN) {}
-
-Assignment::Assignment(const Assignment& other) = default;
-
-Assignment::~Assignment() {}
-
-bool Assignment::IsValid() const {
-  if (engine_endpoint.address().empty() || engine_endpoint.port() == 0 ||
-      transport_protocol == TransportProtocol::UNKNOWN) {
-    return false;
-  }
-  if (transport_protocol == TransportProtocol::SSL && !cert) {
-    return false;
-  }
-  return true;
-}
-
-}  // namespace client
-}  // namespace blimp