[debugger] correctly update test expectation for ThreadedDebugging.

test/cctest/test-debug.cc

Index: test/cctest/test-debug.cc
diff --git a/test/cctest/test-debug.cc b/test/cctest/test-debug.cc
index 025e0a72eb026a3cf6a6c244de6080e2e4a0a3d9..758df68cccd6ae7ad979a079cc750fb8baa75260 100644
--- a/test/cctest/test-debug.cc
+++ b/test/cctest/test-debug.cc
@@ -5413,7 +5413,7 @@ static void ThreadedMessageHandler(const v8::Debug::Message& message) {
   if (IsBreakEventMessage(print_buffer)) {
     // Check that we are inside the while loop.
     int source_line = GetSourceLineFromBreakEventMessage(print_buffer);
-    CHECK(8 <= source_line && source_line <= 13);
+    CHECK(4 <= source_line && source_line <= 10);
     threaded_debugging_barriers.barrier_2.Wait();
   }
 }