Fix use-after-move in //components/mirroring/service/

Fix use-after-move (potential) bugs found by the
"bugprone-use-after-move" clang-tidy check.

Bug: 1122844
Change-Id: I7f67d4dde85e191cba0337a1bffe270c4a407658
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2383016Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803073}

components/mirroring/service/receiver_setup_querier.cc

@@ -89,8 +89,9 @@ void ReceiverSetupQuerier::Query() {
 
   auto url_loader = network::SimpleURLLoader::Create(
       std::move(resource_request), GetAnnotationTag());
+  auto* const url_loader_ptr = url_loader.get();
 
-  url_loader->DownloadToString(
+  url_loader_ptr->DownloadToString(
       url_loader_factory_.get(),
       base::BindOnce(&ReceiverSetupQuerier::ProcessResponse,
                      weak_factory_.GetWeakPtr(), std::move(url_loader)),