Re-enable URLRequest tests disabled due to TestServer flake

net/url_request/url_request_unittest.cc

Index: net/url_request/url_request_unittest.cc
===================================================================
--- net/url_request/url_request_unittest.cc	(revision 177067)
+++ net/url_request/url_request_unittest.cc	(working copy)
@@ -1368,7 +1368,7 @@
                    FilePath()) {}
 };
 
-TEST_F(URLRequestTest, DISABLED_DelayedCookieCallback) {
+TEST_F(URLRequestTest, DelayedCookieCallback) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
@@ -1408,8 +1408,7 @@
   }
 }
 
-// crbug.com/170247
-TEST_F(URLRequestTest, DISABLED_DoNotSendCookies) {
+TEST_F(URLRequestTest, DoNotSendCookies) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
@@ -2053,8 +2052,7 @@
 // issuing a CONNECT request with the magic host name "www.redirect.com".
 // The HTTPTestServer will return a 302 response, which we should not
 // follow.
-// flaky: crbug.com/96594
-TEST_F(URLRequestTestHTTP, DISABLED_ProxyTunnelRedirectTest) {
+TEST_F(URLRequestTestHTTP, ProxyTunnelRedirectTest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestNetworkDelegate network_delegate;  // Must outlive URLRequest.
@@ -4851,7 +4849,7 @@
 };
 
 // Make sure an FTP request using an unsafe ports fails.
-TEST_F(URLRequestTestFTP, DISABLED_UnsafePort) {
+TEST_F(URLRequestTestFTP, UnsafePort) {
   ASSERT_TRUE(test_server_.Start());
 
   URLRequestJobFactoryImpl job_factory;