viz: Fix null callbacks.

Empty once callbacks can't be run, so pass DoNothing callback instead.

Bug: 843458
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I657e750efba2d12fea9f89d3617cfeebbaed78e3
Reviewed-on: https://chromium-review.googlesource.com/1061576
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559103}

components/viz/host/host_frame_sink_manager.cc

@@ -137,7 +137,7 @@ void HostFrameSinkManager::CreateRootCompositorFrameSink(
   // the old CompositorFrameSink first.
   if (data.has_created_compositor_frame_sink) {
     frame_sink_manager_->DestroyCompositorFrameSink(frame_sink_id,
-                                                    base::OnceClosure());
+                                                    base::DoNothing());
   }
 
   data.is_root = true;
@@ -160,7 +160,7 @@ void HostFrameSinkManager::CreateCompositorFrameSink(
   // the old CompositorFrameSink first.
   if (data.has_created_compositor_frame_sink) {
     frame_sink_manager_->DestroyCompositorFrameSink(frame_sink_id,
-                                                    base::OnceClosure());
+                                                    base::DoNothing());
   }
 
   data.is_root = false;