Fixes the cache lock issue.

net/http/failing_http_transaction_factory.cc

Index: net/http/failing_http_transaction_factory.cc
diff --git a/net/http/failing_http_transaction_factory.cc b/net/http/failing_http_transaction_factory.cc
index 7d49327a57a46dfec9e498da811b08310b1304b8..08aafd612782a10240b870a0d9e2008d52e2aa6c 100644
--- a/net/http/failing_http_transaction_factory.cc
+++ b/net/http/failing_http_transaction_factory.cc
@@ -40,6 +40,7 @@ class FailingHttpTransaction : public HttpTransaction {
   int Start(const HttpRequestInfo* request_info,
             const CompletionCallback& callback,
             const NetLogWithSource& net_log) override;
+  void Orphan(std::unique_ptr<HttpTransaction> trans) override;
   int RestartIgnoringLastError(const CompletionCallback& callback) override;
   int RestartWithCertificate(X509Certificate* client_cert,
                              SSLPrivateKey* client_private_key,
@@ -90,6 +91,11 @@ int FailingHttpTransaction::Start(const HttpRequestInfo* request_info,
   return ERR_IO_PENDING;
 }
 
+void FailingHttpTransaction::Orphan(std::unique_ptr<HttpTransaction> trans) {
+  NOTREACHED();
+  return;
+}
+
 int FailingHttpTransaction::RestartIgnoringLastError(
     const CompletionCallback& callback)  {
   return ERR_FAILED;