THRIFT-465. cpp: Fix some STL misuse in the concurrency library test

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@781628 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cpp/src/concurrency/test/ThreadFactoryTests.h b/lib/cpp/src/concurrency/test/ThreadFactoryTests.h
index a98dab6..e4f98a9 100644
--- a/lib/cpp/src/concurrency/test/ThreadFactoryTests.h
+++ b/lib/cpp/src/concurrency/test/ThreadFactoryTests.h
@@ -144,10 +144,6 @@
         }
       }
 
-      for (std::set<shared_ptr<Thread> >::const_iterator thread = threads.begin(); thread != threads.end(); thread++) {
-        threads.erase(*thread);
-      }
-
       std::cout << "\t\t\treaped " << lix * count << " threads" << std::endl;
     }