Fix unitialized memory access in workers.

tools/valgrind/memcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 1121 matching lines @@
    fun:_ZN6WebKit21FrameLoaderClientImpl20createDocumentLoaderERKN7WebCore15ResourceRequestERKNS1_14SubstituteDataE
    fun:_ZN7WebCore11FrameLoader4initEv
    fun:_ZN7WebCore5Frame4initEv
    fun:_ZN6WebKit12WebFrameImpl21initializeAsMainFrameEPNS_11WebViewImplE
    fun:_ZN6WebKit11WebViewImpl19initializeMainFrameEPNS_14WebFrameClientE
    fun:_ZN10RenderView4InitEiiRK19RendererPreferencesPN4base14RefCountedDataIiEEi
    fun:_ZN10RenderView6CreateEP16RenderThreadBaseiiRK19RendererPreferencesRK14WebPreferencesPN4base14RefCountedDataIiEEi
    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
    ...
    fun:_ZN8chromeos8MainMenuC1Ev
 }
 # The following three suppressions are related to the workers code.
 {
    bug_27837
    Memcheck:Leak
@@ skipping 34 matching lines @@
    fun:_Z16DispatchToMethodIN3IPC12ChannelProxy7ContextEMS2_FvRKNS0_7MessageEES3_EvPT_T0_RK6Tuple1IT1_E
    fun:_ZN14RunnableMethodIN3IPC12ChannelProxy7ContextEMS2_FvRKNS0_7MessageEE6Tuple1IS3_EE3RunEv
    fun:_ZN11MessageLoop7RunTaskEP4Task
    fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
    fun:_ZN11MessageLoop6DoWorkEv
    fun:_ZN4base18MessagePumpDefault3RunEPNS_11MessagePump8DelegateE
    fun:_ZN11MessageLoop11RunInternalEv
    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*
    fun:_ZN7history20ExpireHistoryBackend28BroadcastDeleteNotificationsEPNS0_18DeleteDependenciesE
    fun:_ZN7history20ExpireHistoryBackend21ArchiveSomeOldHistoryEN4base4TimeEPKNS_20ExpiringVisitsReaderEi
    fun:_ZN7history20ExpireHistoryBackend18DoArchiveIterationEv
    fun:_Z16DispatchToMethodIN7history20ExpireHistoryBackendEMS1_FvvEEvPT_T0_RK6Tuple0
    fun:_ZN27ScopedRunnableMethodFactoryIN7history20ExpireHistoryBackendEE14RunnableMethodIMS1_FvvE6Tuple0E3RunEv
    fun:_ZN11MessageLoop7RunTaskEP4Task
    fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
@@ skipping 362 matching lines @@
    bug_28200
    Memcheck:Leak
    fun:malloc
    fun:malloc
    fun:_ZN3WTF10fastMallocEj
    fun:_ZN3WTF13FastAllocBasenwEj
    fun:_ZN7WebCore18MessagePortChannel6createEN3WTF10PassRefPtrINS_26PlatformMessagePortChannelEEE
    fun:_ZN6WebKit19WebSharedWorkerImpl7connectEPNS_21WebMessagePortChannelEPNS_15WebSharedWorker15ConnectListenerE
    fun:_ZN19WebSharedWorkerStub9OnConnectEii
 }