thread_stress_test: default timeout is sufficient
diff --git a/build.yaml b/build.yaml
index 592cbb9..5ab245b 100644
--- a/build.yaml
+++ b/build.yaml
@@ -4838,7 +4838,6 @@
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  timeout_seconds: 1200
 - name: transport_pid_controller_test
   build: test
   language: c++
diff --git a/tools/run_tests/generated/tests.json b/tools/run_tests/generated/tests.json
index 3b1b658..54cd38b 100644
--- a/tools/run_tests/generated/tests.json
+++ b/tools/run_tests/generated/tests.json
@@ -4522,7 +4522,6 @@
       "posix", 
       "windows"
     ], 
-    "timeout_seconds": 1200, 
     "uses_polling": true
   }, 
   {