clean up some old network service if checks

Network service is enabled by default, the if checks can go away

BUG=934009, 990490

Change-Id: Iaaed4aa95f3a2d9dcda7a10c82e57b539a5539fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733793Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683804}

components/download/internal/common/download_file_impl.cc

@@ -564,9 +564,6 @@ void DownloadFileImpl::Resume() {
   DCHECK(is_paused_);
   is_paused_ = false;
 
-  if (!base::FeatureList::IsEnabled(network::features::kNetworkService))
-    return;
-
   for (auto& stream : source_streams_) {
     SourceStream* source_stream = stream.second.get();
     if (!source_stream->is_finished()) {
@@ -578,8 +575,7 @@ void DownloadFileImpl::Resume() {
 void DownloadFileImpl::StreamActive(SourceStream* source_stream,
                                     MojoResult result) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
-  if (base::FeatureList::IsEnabled(network::features::kNetworkService) &&
-      is_paused_)
+  if (is_paused_)
     return;
 
   base::TimeTicks start(base::TimeTicks::Now());