storage: Cleanup class/struct forward declarations

storage/browser/blob/blob_entry.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 STORAGE_BROWSER_BLOB_BLOB_ENTRY_H_
 #define STORAGE_BROWSER_BLOB_BLOB_ENTRY_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/optional.h"
 #include "storage/browser/blob/blob_memory_controller.h"
 #include "storage/browser/storage_browser_export.h"
 
 namespace storage {
 class BlobDataHandle;
 class ShareableBlobDataItem;
-class ViewBlobInternalsJob;
 
 // Represents a blob in BlobStorageRegistry. Exported only for unit tests.
 class STORAGE_EXPORT BlobEntry {
  public:
   using TransportAllowedCallback =
       base::Callback<void(BlobStatus,
                           std::vector<BlobMemoryController::FileCreationInfo>)>;
 
   // Records a copy from a referenced blob. Copies happen after referenced blobs
   // are complete & quota for the copies is granted.
@@ skipping 126 matching lines @@
   std::vector<uint64_t> offsets_;
 
   // Only populated if our status is PENDING_*.
   std::unique_ptr<BuildingState> building_state_;
 
   DISALLOW_COPY_AND_ASSIGN(BlobEntry);
 };
 
 }  // namespace storage
 #endif  // STORAGE_BROWSER_BLOB_BLOB_ENTRY_H_