Fix unitialized memory access in workers.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
diff --git a/tools/valgrind/memcheck/suppressions.txt b/tools/valgrind/memcheck/suppressions.txt
index 2a2c26ed91d13b9726e632c8b38f1a757e66b4ce..0e9db9ee7b8537e806bb95a5978cb3270f9375c1 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -1139,16 +1139,6 @@
    fun:_ZN12RenderThread15OnCreateNewViewEiRK19RendererPreferencesRK14WebPreferencesi
 }
 {
-   bug_27318
-   Memcheck:Cond
-   fun:_ZN21MessagePortDispatcher7ObserveE16NotificationTypeRK18NotificationSourceRK19NotificationDetails
-   fun:_ZN19NotificationService6NotifyE16NotificationTypeRK18NotificationSourceRK19NotificationDetails
-   fun:_ZN17WorkerProcessHostD0Ev
-   fun:_ZN16ChildProcessHost11OnChildDiedEv
-   fun:_ZN16ChildProcessHost12ListenerHook14OnChannelErrorEv
-   fun:_ZN3IPC7Channel11ChannelImpl28OnFileCanReadWithoutBlockingEi
-}
-{
    # See comment in main_menu.cc
    main_menu_leak
    Memcheck:Leak
@@ -1203,49 +1193,6 @@
    fun:_ZN11MessageLoop10RunHandlerEv
 }
 {
-   bug_27839
-   Memcheck:Cond
-   fun:_ZN21MessagePortDispatcher7ObserveE16NotificationTypeRK18NotificationSourceRK19NotificationDetails
-   fun:_ZN19NotificationService6NotifyE16NotificationTypeRK18NotificationSourceRK19NotificationDetails
-   fun:_ZN21ResourceMessageFilterD0Ev
-   fun:_ZN12ChromeThread14DeleteOnThreadILNS_2IDE4EE8DestructI21ResourceMessageFilterEEvPT_
-   fun:_ZN21ResourceMessageFilter10OnDestructEv
-   fun:_ZN3IPC12ChannelProxy19MessageFilterTraits8DestructEPNS0_13MessageFilterE
-   fun:_ZN4base20RefCountedThreadSafeIN3IPC12ChannelProxy13MessageFilterENS2_19MessageFilterTraitsEE7ReleaseEv
-   fun:_ZN13scoped_refptrIN3IPC12ChannelProxy13MessageFilterEED1Ev
-   fun:_ZSt8_DestroyI13scoped_refptrIN3IPC12ChannelProxy13MessageFilterEEEvPT_
-   fun:_ZSt13__destroy_auxIP13scoped_refptrIN3IPC12ChannelProxy13MessageFilterEEEvT_S6_St12__false_type
-   fun:_ZSt8_DestroyIP13scoped_refptrIN3IPC12ChannelProxy13MessageFilterEEEvT_S6_
-   fun:_ZSt8_DestroyIP13scoped_refptrIN3IPC12ChannelProxy13MessageFilterEES4_EvT_S6_SaIT0_E
-   fun:_ZNSt6vectorI13scoped_refptrIN3IPC12ChannelProxy13MessageFilterEESaIS4_EE15_M_erase_at_endEPS4_
-   fun:_ZNSt6vectorI13scoped_refptrIN3IPC12ChannelProxy13MessageFilterEESaIS4_EE5clearEv
-   fun:_ZN3IPC12ChannelProxy7Context15OnChannelClosedEv
-   fun:_ZN3IPC11SyncChannel11SyncContext15OnChannelClosedEv
-   fun:_Z16DispatchToMethodIN3IPC12ChannelProxy7ContextEMS2_FvvEEvPT_T0_RK6Tuple0
-   fun:_ZN14RunnableMethodIN3IPC12ChannelProxy7ContextEMS2_FvvE6Tuple0E3RunEv
-   fun:_ZN11MessageLoop7RunTaskEP4Task
-   fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
-   fun:_ZN11MessageLoop6DoWorkEv
-   fun:_ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE
-}
-{
-   bug_27922
-   Memcheck:Cond
-   fun:_ZN21MessagePortDispatcher7ObserveE16NotificationTypeRK18NotificationSourceRK19NotificationDetails
-   fun:_ZN19NotificationService6NotifyE16NotificationTypeRK18NotificationSourceRK19NotificationDetails
-   fun:_ZN21ResourceMessageFilter14OnChannelErrorEv
-   fun:_ZN3IPC12ChannelProxy7Context14OnChannelErrorEv
-   fun:_ZN3IPC11SyncChannel11SyncContext14OnChannelErrorEv
-   fun:_ZN3IPC12ChannelProxy7Context13OnSendMessageEPNS_7MessageE
-   fun:_ZN3IPC8SendTask3RunEv
-   fun:_ZN11MessageLoop7RunTaskEP4Task
-   fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
-   fun:_ZN11MessageLoop6DoWorkEv
-   fun:_ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE
-   fun:_ZN11MessageLoop11RunInternalEv
-   fun:_ZN11MessageLoop10RunHandlerEv
-}
-{
    bug_27936
    Memcheck:Leak
    fun:_Znw*