Fix an issue that we didn't clean url request properly.

content/browser/download/download_file_impl.cc

Index: content/browser/download/download_file_impl.cc
diff --git a/content/browser/download/download_file_impl.cc b/content/browser/download/download_file_impl.cc
index f65534b2c0783a97d5f587a70711d2d625077644..a4a150681a555b0ffdb9b15815497a8444297c9b 100644
--- a/content/browser/download/download_file_impl.cc
+++ b/content/browser/download/download_file_impl.cc
@@ -328,6 +328,8 @@ void DownloadFileImpl::RenameWithRetryInternal(
     SendUpdate();
 
     // Null out callback so that we don't do any more stream processing.
+    // The request that writes to the pipe should be canceled after
+    // download interrupted.
     for (auto& stream : source_streams_) {
       ByteStreamReader* stream_reader = stream.second->stream_reader();
       if (stream_reader)
@@ -469,6 +471,7 @@ void DownloadFileImpl::StreamActive(SourceStream* source_stream) {
     // Signal successful completion or termination of the current stream.
     source_stream->stream_reader()->RegisterCallback(base::Closure());
     source_stream->set_finished(true);
+    streams_to_close_.emplace(source_stream->offset());
     if (source_stream->length() == DownloadSaveInfo::kLengthFullContent) {
       SetPotentialFileLength(source_stream->offset() +
                              source_stream->bytes_written());
@@ -533,7 +536,8 @@ void DownloadFileImpl::SendUpdate() {
       BrowserThread::UI, FROM_HERE,
       base::Bind(&DownloadDestinationObserver::DestinationUpdate, observer_,
                  TotalBytesReceived(), rate_estimator_.GetCountPerSecond(),
-                 received_slices_));
+                 received_slices_, streams_to_close_));
+  streams_to_close_.clear();
 }
 
 void DownloadFileImpl::WillWriteToDisk(size_t data_len) {
@@ -641,6 +645,7 @@ void DownloadFileImpl::HandleStreamError(SourceStream* source_stream,
           DCHECK_EQ(stream.second->bytes_written(), 0);
           stream.second->stream_reader()->RegisterCallback(base::Closure());
           stream.second->set_finished(true);
+          streams_to_close_.emplace(stream.second->offset());
           num_active_streams_--;
         }
       }