Revert of Remove remnants of DHE support.

net/url_request/url_request_unittest.cc

Index: net/url_request/url_request_unittest.cc
diff --git a/net/url_request/url_request_unittest.cc b/net/url_request/url_request_unittest.cc
index ebebfac6befad9c7f3dd428f941ba2550361d0c9..580768775a67ecbb773be3bb7656c2a4b4ccee4e 100644
--- a/net/url_request/url_request_unittest.cc
+++ b/net/url_request/url_request_unittest.cc
@@ -8875,6 +8875,31 @@
   EXPECT_EQ(kOriginHeaderValue, received_cors_header);
 }
 
+// Test that DHE-only servers fail with the expected dedicated error code.
+TEST_F(HTTPSRequestTest, DHE) {
+  SpawnedTestServer::SSLOptions ssl_options;
+  ssl_options.key_exchanges =
+      SpawnedTestServer::SSLOptions::KEY_EXCHANGE_DHE_RSA;
+  SpawnedTestServer test_server(
+      SpawnedTestServer::TYPE_HTTPS, ssl_options,
+      base::FilePath(FILE_PATH_LITERAL("net/data/ssl")));
+  ASSERT_TRUE(test_server.Start());
+
+  TestDelegate d;
+  {
+    std::unique_ptr<URLRequest> r(default_context_.CreateRequest(
+        test_server.GetURL("/defaultresponse"), DEFAULT_PRIORITY, &d));
+
+    r->Start();
+    EXPECT_TRUE(r->is_pending());
+
+    base::RunLoop().Run();
+
+    EXPECT_EQ(1, d.response_started_count());
+    EXPECT_EQ(ERR_SSL_OBSOLETE_CIPHER, d.request_status());
+  }
+}
+
 namespace {
 
 class SSLClientAuthTestDelegate : public TestDelegate {