Remove all blimp client code.

blimp/client/support/session/blimp_default_identity_provider.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_SUPPORT_SESSION_BLIMP_DEFAULT_IDENTITY_PROVIDER_H_
-#define BLIMP_CLIENT_SUPPORT_SESSION_BLIMP_DEFAULT_IDENTITY_PROVIDER_H_
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "google_apis/gaia/identity_provider.h"
-
-namespace blimp {
-namespace client {
-
-// Provides a dummy identity provider with a null token service that doesn't
-// actually log in. Useful when using command-line switches to get the
-// assignment.
-class BlimpDefaultIdentityProvider : public IdentityProvider {
- public:
-  BlimpDefaultIdentityProvider();
-  ~BlimpDefaultIdentityProvider() override;
-
-  // IdentityProvider implementation.
-  std::string GetActiveUsername() override;
-  std::string GetActiveAccountId() override;
-  OAuth2TokenService* GetTokenService() override;
-  bool RequestLogin() override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(BlimpDefaultIdentityProvider);
-};
-
-}  // namespace client
-}  // namespace blimp
-
-#endif  // BLIMP_CLIENT_SUPPORT_SESSION_BLIMP_DEFAULT_IDENTITY_PROVIDER_H_