[ChromeDriver] add timeout for HTTP Requests

During InitSession calls, add a timeout when ChromeDriver is requesting
initial connection details from Chrome. This will protect against
waiting indefinitely when Chrome is unresponsive.

Bug: chromedriver:2520
Change-Id: Ie160118a4b281e2651ab7f155a4cd36b740f1c7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2110813Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Tricia Crichton <triciac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752041}

chrome/test/chromedriver/net/net_util.cc

@@ -57,6 +57,7 @@ class SyncUrlFetcher {
 
     loader_ = network::SimpleURLLoader::Create(std::move(request),
                                                TRAFFIC_ANNOTATION_FOR_TESTS);
+    loader_->SetTimeoutDuration(base::TimeDelta::FromSeconds(10));
     loader_->DownloadToStringOfUnboundedSizeUntilCrashAndDie(
         url_loader_factory_, base::BindOnce(&SyncUrlFetcher::OnURLLoadComplete,
                                             base::Unretained(this)));