Remove unused include in sequenced_worker_pool.h

chrome/browser/chromeos/policy/upload_job_impl.h

 // Copyright 2015 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 CHROME_BROWSER_CHROMEOS_POLICY_UPLOAD_JOB_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_UPLOAD_JOB_IMPL_H_
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "base/threading/thread_checker.h"
 #include "chrome/browser/chromeos/policy/upload_job.h"
 #include "google_apis/gaia/oauth2_token_service.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "url/gurl.h"
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace policy {
 
 // This implementation of UploadJob uses the OAuth2TokenService to acquire
 // access tokens for the device management (cloud-based policy) server scope and
 // uses a URLFetcher to upload data to the specified upload url.
 class UploadJobImpl : public UploadJob,
                       public OAuth2TokenService::Consumer,
                       public net::URLFetcherDelegate {
  public:
   // UploadJobImpl uses a MimeBoundaryGenerator to generate strings which
@@ skipping 140 matching lines @@
   // Should remain the last member so it will be destroyed first and
   // invalidate all weak pointers.
   base::WeakPtrFactory<UploadJobImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UploadJobImpl);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_UPLOAD_JOB_IMPL_H_