Valgrind: Remove suppressions for bug 91771, which has been fixed.

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 # running overnight and removing outdated bugs/suppressions.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 5135 matching lines @@
    fun:_ZN3net13URLRequestJob21NotifyHeadersCompleteEv
    fun:_ZN19URLRequestChromeJob10StartAsyncEv
 }
 {
    bug_91491
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN16CrxUpdateService19ProcessPendingItemsEv
 }
 {
-   bug_91771_a
-   Memcheck:Value4
-   ...
-   fun:_ZN12sync_ui_util25ConstructAboutInformationEP18ProfileSyncServicePN4base15DictionaryValueE
-   fun:_ZN71SyncUIUtilTest_ConstructAboutInformationWithUnrecoverableErrorTest_Test8TestBodyEv
-}
-{
-   bug_91771_b
-   Memcheck:Cond
-   ...
-   fun:_ZN12sync_ui_util25ConstructAboutInformationEP18ProfileSyncServicePN4base15DictionaryValueE
-   fun:_ZN71SyncUIUtilTest_ConstructAboutInformationWithUnrecoverableErrorTest_Test8TestBodyEv
-}
-{
    bug_92123
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN11MessageLoop10DeleteSoonIN4base20MessageLoopProxyImplEEEvRKN15tracked_objects8LocationEPKT_
    fun:_ZNK4base20MessageLoopProxyImpl10OnDestructEv
    fun:_ZN4base22MessageLoopProxyTraits8DestructEPKNS_16MessageLoopProxyE
    fun:_ZNK4base20RefCountedThreadSafeINS_16MessageLoopProxyENS_22MessageLoopProxyTraitsEE7ReleaseEv
    fun:_ZN13scoped_refptrIN4base16MessageLoopProxyEED1Ev
    fun:_ZN3net16HostResolverImpl3JobD1Ev
    fun:_ZN4base20RefCountedThreadSafeIN3net16HostResolverImpl3JobENS_33DefaultRefCountedThreadSafeTraitsIS3_EEE14DeleteInternalEPKS3_
@@ skipping 291 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
 }