Make URLRequest::Read to return net errors or bytes read instead of a bool

net/test/embedded_test_server/embedded_test_server_unittest.cc

Index: net/test/embedded_test_server/embedded_test_server_unittest.cc
diff --git a/net/test/embedded_test_server/embedded_test_server_unittest.cc b/net/test/embedded_test_server/embedded_test_server_unittest.cc
index a143ae376bc8fde029acecf485a0a0881006ee17..3919b98bd5d2790d6a8036cdb93c6a667be66611 100644
--- a/net/test/embedded_test_server/embedded_test_server_unittest.cc
+++ b/net/test/embedded_test_server/embedded_test_server_unittest.cc
@@ -389,8 +389,8 @@ class CancelRequestDelegate : public TestDelegate {
   CancelRequestDelegate() {}
   ~CancelRequestDelegate() override {}
 
-  void OnResponseStarted(URLRequest* request) override {
-    TestDelegate::OnResponseStarted(request);
+  void OnResponseStarted(URLRequest* request, int net_error) override {
+    TestDelegate::OnResponseStarted(request, net_error);
     base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, run_loop_.QuitClosure(), base::TimeDelta::FromSeconds(1));
   }