Remove all blimp client code.

blimp/client/core/context/assignment_fetcher.h

-// 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.
-
-#ifndef BLIMP_CLIENT_CORE_CONTEXT_ASSIGNMENT_FETCHER_H_
-#define BLIMP_CLIENT_CORE_CONTEXT_ASSIGNMENT_FETCHER_H_
-
-#include <memory>
-#include <string>
-
-#include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
-#include "blimp/client/core/session/assignment_source.h"
-#include "blimp/client/core/session/identity_source.h"
-
-namespace blimp {
-namespace client {
-
-class AssignmentFetcher {
- public:
-  using AuthErrorCallback = base::Callback<void(const GoogleServiceAuthError&)>;
-  using AssignmentResultCallback =
-      base::Callback<void(AssignmentRequestResult, const Assignment&)>;
-
-  AssignmentFetcher(
-      scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
-      std::unique_ptr<IdentityProvider> identity_provider,
-      GURL assigner_url,
-      const AssignmentResultCallback& assignment_received_callback,
-      const AuthErrorCallback& error_callback);
-
-  ~AssignmentFetcher();
-
-  void Fetch();
-
-  IdentitySource* GetIdentitySource();
-
- private:
-  // Called when an OAuth2 token is received.  Will then ask the
-  // AssignmentSource for an Assignment with this token.
-  void OnAuthTokenReceived(const std::string& client_auth_token);
-
-  // Provide OAuth2 token and propagate account sign in states change.
-  std::unique_ptr<IdentitySource> identity_source_;
-
-  AssignmentResultCallback assignment_received_callback_;
-
-  // Returns the URL to use for connections to the assigner. Used to construct
-  // the AssignmentSource.
-  GURL assigner_url_;
-
-  // The AssignmentSource is used when the user of AssignmentFetcher calls
-  // Fetch() to get a valid assignment and later connect to the engine.
-  std::unique_ptr<AssignmentSource> assignment_source_;
-
-  // The task runner to use for IO operations.
-  scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
-
-  // The task runner to use for file operations.
-  scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(AssignmentFetcher);
-};
-
-}  // namespace client
-}  // namespace blimp
-
-#endif  // BLIMP_CLIENT_CORE_CONTEXT_ASSIGNMENT_FETCHER_H_