Fix memory leak in SequencedWorkerPool

tools/valgrind/memcheck/suppressions_mac.txt

Index: tools/valgrind/memcheck/suppressions_mac.txt
diff --git a/tools/valgrind/memcheck/suppressions_mac.txt b/tools/valgrind/memcheck/suppressions_mac.txt
index d6a3734f2c63e025a7eba1fd663b0dd8c11f8300..447e901a1bb536070b6732b446f4a8a7070d4700 100644
--- a/tools/valgrind/memcheck/suppressions_mac.txt
+++ b/tools/valgrind/memcheck/suppressions_mac.txt
@@ -2358,30 +2358,3 @@
    fun:find_registered_purgeable_zone
    fun:malloc_make_purgeable
 }
-{
-   bug_115987_a
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN4base19SequencedWorkerPool5Inner30FinishStartingAdditionalThreadEi
-   fun:_ZN4base19SequencedWorkerPool5Inner*
-}
-{
-   bug_115987_b
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN4base12_GLOBAL__N_123SequencedWorkerPoolTestC2Ev
-   fun:_ZN4base*SequencedWorkerPoolTest_*
-   fun:_ZN4base*SequencedWorkerPoolTest_*
-   fun:_ZN7testing8internal15TestFactoryImplIN4base*SequencedWorkerPoolTest_*
-}
-{
-   bug_115987_c
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN9__gnu_cxx13new_allocatorI10linked_ptrIN4base19SequencedWorkerPool6WorkerEEE8allocateEmPKv
-   fun:_ZNSt12_Vector_baseI10linked_ptrIN4base19SequencedWorkerPool6WorkerEESaIS4_EE11_M_allocateEm
-   fun:_ZNSt6vectorI10linked_ptrIN4base19SequencedWorkerPool6WorkerEESaIS4_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS4_S6_EERKS4_
-   fun:_ZNSt6vectorI10linked_ptrIN4base19SequencedWorkerPool6WorkerEESaIS4_EE9push_backERKS4_
-   fun:_ZN4base19SequencedWorkerPool5Inner10ThreadLoopEPNS0_6WorkerE
-   fun:_ZN4base19SequencedWorkerPool6Worker3RunEv
-}