Add CHECK to ChunkedDataPipeUploadDataStream to investigate crash

Bug: 1156550
Change-Id: I683f7e82c19db65aaaab49746ab5d7880ef96321
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581658
Auto-Submit: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835298}

services/network/chunked_data_pipe_upload_data_stream.cc

@@ -23,6 +23,9 @@ ChunkedDataPipeUploadDataStream::ChunkedDataPipeUploadDataStream(
       handle_watcher_(FROM_HERE,
                       mojo::SimpleWatcher::ArmingPolicy::MANUAL,
                       base::SequencedTaskRunnerHandle::Get()) {
+  // TODO(yhirano): Turn this to a DCHECK once we find the root cause of
+  // https://crbug.com/1156550.
+  CHECK(chunked_data_pipe_getter_.is_bound());
   chunked_data_pipe_getter_.set_disconnect_handler(
       base::BindOnce(&ChunkedDataPipeUploadDataStream::OnDataPipeGetterClosed,
                      base::Unretained(this)));