Remove stl_util's STLDeleteContainerPairSecondPointers from net/.

net/test/embedded_test_server/embedded_test_server.h

Index: net/test/embedded_test_server/embedded_test_server.h
diff --git a/net/test/embedded_test_server/embedded_test_server.h b/net/test/embedded_test_server/embedded_test_server.h
index a1faa7cc72284a996e89ac160d507be846d559d2..33a1e320eb6ad5278e7f7761922d1ccea2ebc9af 100644
--- a/net/test/embedded_test_server/embedded_test_server.h
+++ b/net/test/embedded_test_server/embedded_test_server.h
@@ -278,8 +278,7 @@ class EmbeddedTestServer {
   GURL base_url_;
   IPEndPoint local_endpoint_;
 
-  // Owns the HttpConnection objects.
-  std::map<StreamSocket*, HttpConnection*> connections_;
+  std::map<StreamSocket*, std::unique_ptr<HttpConnection>> connections_;
 
   // Vector of registered and default request handlers and monitors.
   std::vector<HandleRequestCallback> request_handlers_;