Clean up thread handling in Blimp browser tests.

blimp/net/blob_channel/blob_channel_sender_impl.cc

 // 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.
 
 #include "blimp/net/blob_channel/blob_channel_sender_impl.h"
 
 #include <utility>
 
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "blimp/common/blob_cache/blob_cache.h"
 #include "blimp/common/blob_cache/id_util.h"
 
 namespace blimp {
 
 BlobChannelSenderImpl::BlobChannelSenderImpl(std::unique_ptr<BlobCache> cache,
                                              std::unique_ptr<Delegate> delegate)
-    : cache_(std::move(cache)), delegate_(std::move(delegate)) {
+    : cache_(std::move(cache)),
+      delegate_(std::move(delegate)),
+      weak_factory_(this) {
   DCHECK(cache_);
   DCHECK(delegate_);
 }
 
 BlobChannelSenderImpl::~BlobChannelSenderImpl() {}
 
+base::WeakPtr<BlobChannelSenderImpl> BlobChannelSenderImpl::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
 std::vector<BlobChannelSender::CacheStateEntry>
 BlobChannelSenderImpl::GetCachedBlobIds() const {
   const auto cache_state = cache_->GetCachedBlobIds();
   std::vector<CacheStateEntry> output;
   output.reserve(cache_state.size());
   for (const std::string& cached_id : cache_state) {
     CacheStateEntry next_output;
     next_output.id = cached_id;
     next_output.was_delivered =
         base::ContainsKey(receiver_cache_contents_, cached_id);
@@ skipping 24 matching lines @@
     DVLOG(3) << "Suppressed redundant push: " << BlobIdToString(id);
     return;
   }
   receiver_cache_contents_.insert(id);
 
   VLOG(2) << "Deliver blob: " << BlobIdToString(id);
   delegate_->DeliverBlob(id, cache_->Get(id));
 }
 
 }  // namespace blimp