Revert 99666 (sync tests started failing on mac10.6:

tools/valgrind/memcheck/suppressions.txt

 # There are four 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 # running overnight and removing outdated bugs/suppressions.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 2221 matching lines @@
    fun:malloc
    ...
    fun:_ZN3WTF13wtfThreadDataEv
    fun:_ZN3WTF11stringTableEv
    ...
    fun:_ZN6WebKit10initializeEPNS_12WebKitClientE
    fun:_ZN12WebKitThread20InternalWebKitThread4InitEv
    fun:_ZN4base6Thread10ThreadMainEv
 }
 {
+   bug_46161
+   Memcheck:Leak
+   fun:_Znw*
+   fun:*DnsReloadTimer7ExpiredEv
+   fun:_ZN3net24DnsReloadTimerHasExpiredEv
+   fun:_ZN3net22SystemHostResolverProcERKSsNS_13AddressFamilyEiPNS_11AddressListEPi
+   fun:_ZN3net*15ResolveAddrInfoEPNS_16HostResolverProc*
+   fun:_ZN3net16HostResolverImpl3Job8DoLookup*
+   fun:_Z16DispatchToMethodIN3net16HostResolverImpl*
+   fun:_ZN14RunnableMethodIN3net16HostResolverImpl*
+}
+{
    bug_46250
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN9__gnu_cxx13new_allocatorIPN11MessageLoop12TaskObserverEE8allocateEjPKv
    fun:_ZNSt12_Vector_baseIPN11MessageLoop12TaskObserverESaIS2_EE11_M_allocateEj
    fun:_ZNSt6vectorIPN11MessageLoop12TaskObserverESaIS2_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS2_S4_EERKS2_
    fun:_ZNSt6vectorIPN11MessageLoop12TaskObserverESaIS2_EE9push_backERKS2_
    fun:_ZN16ObserverListBaseIN11MessageLoop12TaskObserverEE11AddObserverEPS1_
    fun:_ZN11MessageLoop15AddTaskObserverEPNS_12TaskObserverE
    fun:*IOJankObserver21AttachToCurrentThreadEv
@@ skipping 2533 matching lines @@
 {
    bug_89311
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN3net16HttpStreamParser22DoParseResponseHeadersEi
    fun:_ZN3net16HttpStreamParser20ParseResponseHeadersEv
    fun:_ZN3net16HttpStreamParser21DoReadHeadersCompleteEi
 }
 {
-   bug_89553
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN12_GLOBAL__N_111DnsReloader11MaybeReloadEv
-   fun:_ZN3net22DnsReloaderMaybeReloadEv
-   fun:_ZN3net22SystemHostResolverProcERKSsNS_13AddressFamilyEiPNS_11AddressListEPi
-   ...
-   fun:_ZN3net*15ResolveAddrInfoEPNS_16HostResolverProc*
-   fun:_ZN3net16HostResolverImpl3Job8DoLookup*
-   fun:_Z16DispatchToMethodIN3net16HostResolverImpl*
-   fun:_ZN14RunnableMethodIN3net16HostResolverImpl*
-}
-{
    bug_89677
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN27ScopedRunnableMethodFactoryI13ThreadWatcherE17NewRunnableMethodIMS0_FvyEyEEP14CancelableTaskT_RKT0_
    fun:_ZN13ThreadWatcher15PostPingMessageEv
    fun:_Z16DispatchToMethodI13ThreadWatcherMS0_FvvEEvPT_T0_RK6Tuple0
    fun:_ZN27ScopedRunnableMethodFactoryI13ThreadWatcherE14RunnableMethodIMS0_FvvE6Tuple0E3RunEv
    fun:*18TaskClosureAdapter3RunEv
    fun:_ZN4base8internal8Invoker1ILb0ENS0_15InvokerStorage1*18TaskClosureAdapterEFvvEPS4_EES6_E8DoInvokeEPNS0_18InvokerStorageBaseE
    fun:_ZNK4base8CallbackIFvvEE3RunEv
@@ skipping 624 matching lines @@
 }
 {
    bug_todo_getdelim2
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }