Clean up thread handling in Blimp browser tests.

blimp/net/blob_channel/blob_channel_sender_impl.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_NET_BLOB_CHANNEL_BLOB_CHANNEL_SENDER_IMPL_H_
 #define BLIMP_NET_BLOB_CHANNEL_BLOB_CHANNEL_SENDER_IMPL_H_
 
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "blimp/common/blob_cache/blob_cache.h"
 #include "blimp/net/blimp_net_export.h"
 #include "blimp/net/blob_channel/blob_channel_sender.h"
 
 namespace blimp {
 
 // Sends blobs to a remote receiver.
 // The transport-specific details are provided by the caller using the Delegate
 // subclass.
@@ skipping 21 matching lines @@
 
  private:
   std::unique_ptr<BlobCache> cache_;
   std::unique_ptr<Delegate> delegate_;
 
   // Used to track the item IDs in the receiver's cache. This may differ from
   // the set of IDs in |cache_|, for instance if an ID hasn't yet been
   // delivered, or has been evicted at the receiver.
   std::set<BlobId> receiver_cache_contents_;
 
+  base::WeakPtrFactory<BlobChannelSenderImpl> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(BlobChannelSenderImpl);
 };
 
 }  // namespace blimp
 
 #endif  // BLIMP_NET_BLOB_CHANNEL_BLOB_CHANNEL_SENDER_IMPL_H_