Bring quic_write_blocked_list_test.cc in sync with google3

R=rch@chromium.org

Change-Id: Ie45a70cecf865edefa565bff8b8af1d51e0b0705
Reviewed-on: https://chromium-review.googlesource.com/c/1277582Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Victor Vasiliev <vasilvv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599338}

net/third_party/quic/core/quic_write_blocked_list_test.cc

@@ -175,7 +175,6 @@ TEST_F(QuicWriteBlockedListTest, BatchingWrites) {
   // Once the higher priority stream is out of the way, id2 will resume its 16k
   // write, with only 1 byte remaining of its guaranteed write allocation.
   EXPECT_EQ(id2, write_blocked_list.PopFront());
-  write_blocked_list.AddStream(id2);
   write_blocked_list.UpdateBytesForStream(id2, 1);
   write_blocked_list.AddStream(id2);
   EXPECT_EQ(2u, write_blocked_list.NumBlockedStreams());