Remove unused include in sequenced_worker_pool.h

storage/browser/blob/blob_data_handle.h

 // Copyright (c) 2013 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 STORAGE_BROWSER_BLOB_BLOB_DATA_HANDLE_H_
 #define STORAGE_BROWSER_BLOB_BLOB_DATA_HANDLE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 29 matching lines @@
     : public base::SupportsUserData::Data {
  public:
   // True means the blob was constructed successfully, and false means that
   // there was an error, which is reported in the second argument.
   using BlobConstructedCallback =
       base::Callback<void(bool, IPCBlobCreationCancelCode)>;
 
   BlobDataHandle(const BlobDataHandle& other);  // May be copied on any thread.
   ~BlobDataHandle() override;                   // May be deleted on any thread.
 
+  // Assignment operator matching copy constructor.
+  BlobDataHandle& operator=(const BlobDataHandle& other);
+
   // Returns if this blob is still constructing. If so, one can use the
   // RunOnConstructionComplete to wait.
   // Must be called on IO thread.
   bool IsBeingBuilt() const;
 
   // Returns if this blob is broken, and there is no data associated with it.
   // Must be called on IO thread.
   bool IsBroken() const;
 
   // The callback will be run on the IO thread when construction of the blob
@@ skipping 58 matching lines @@
                  BlobStorageContext* context,
                  base::SequencedTaskRunner* io_task_runner);
 
   scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
   scoped_refptr<BlobDataHandleShared> shared_;
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_BLOB_BLOB_DATA_HANDLE_H_