Allow CertNetFetcher to be shutdown from the network thread

net/tools/cert_verify_tool/verify_using_path_builder.cc

Index: net/tools/cert_verify_tool/verify_using_path_builder.cc
diff --git a/net/tools/cert_verify_tool/verify_using_path_builder.cc b/net/tools/cert_verify_tool/verify_using_path_builder.cc
index adaf5fe5d81aab62aa3d1b15f25d57e62acc3d14..3878624b810df9d87f6d26d8ef586dd66318f6fa 100644
--- a/net/tools/cert_verify_tool/verify_using_path_builder.cc
+++ b/net/tools/cert_verify_tool/verify_using_path_builder.cc
@@ -284,17 +284,19 @@ bool VerifyUsingPathBuilder(
   base::Thread::Options options(base::MessageLoop::TYPE_IO, 0);
   base::Thread thread("network_thread");
   CHECK(thread.StartWithOptions(options));
+
   scoped_refptr<URLRequestContextGetterForAia> url_request_context_getter(
       new URLRequestContextGetterForAia(thread.task_runner()));
+  // Create a CertNetFetcher to be initialized on the network thread.
   auto cert_net_fetcher =
-      CreateCertNetFetcher(url_request_context_getter.get());
+      CreateCertNetFetcherOnCallerThread(url_request_context_getter.get());
   net::CertIssuerSourceAia aia_cert_issuer_source(cert_net_fetcher.get());

[eroman, 2017/01/03 20:42:38]

net::CertIssuerSourceAia should be updated to hold a reference to the
CertNetFetcher.

[estark, 2017/01/05 19:08:40]

Done.

   path_builder.AddCertIssuerSource(&aia_cert_issuer_source);
 
   // Run the path builder.
   path_builder.Run();
 
-  // Stop the temporary network thread..
+  // Stop the temporary network thread.
   url_request_context_getter->ShutDown();
   thread.Stop();