Remove InMemoryURLIndex::Shutdown Valgrind Suppression

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 # running overnight and removing outdated bugs/suppressions.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 3494 matching lines @@
    fun:_ZN8notifier5Login15StartConnectionEv
    fun:_ZN13sync_notifier20InvalidationNotifier17UpdateCredentialsERKSsS2_
 }
 {
    bug_118890_b
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN13sync_notifier12_GLOBAL__N_124InvalidationNotifierTest5SetUpEv
 }
 {
-   bug_122177
-   Memcheck:Leak
-   ...
-   fun:_ZN7history16InMemoryURLIndex23PostSaveToCacheFileTaskEv
-   fun:_ZN7history16InMemoryURLIndex8ShutDownEv
-   fun:_ZN14HistoryService13UnloadBackendEv
-   fun:_ZN14HistoryService7CleanupEv
-}
-{
    bug_122189
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN5blink16ChromeClientImpl18createColorChooserEPN7WebCore18ColorChooserClientERKNS1_5ColorE
    fun:_ZN7WebCore6Chrome18createColorChooserEPNS_18ColorChooserClientERKNS_5ColorE
    fun:_ZN7WebCore14ColorInputType22handleDOMActivateEventEPNS_5EventE
    fun:_ZN7WebCore16HTMLInputElement19defaultEventHandlerEPNS_5EventE
    fun:_ZN7WebCore15EventDispatcher13dispatchEventEN3WTF10PassRefPtrINS_5EventEEE
    fun:_ZNK7WebCore21EventDispatchMediator13dispatchEventEPNS_15EventDispatcherE
 }
@@ skipping 2840 matching lines @@
    fun:_ZN15google_breakpad16ExceptionHandler12HandleSignalEiP7siginfoPv
    fun:_ZN15google_breakpad16ExceptionHandler13SignalHandlerEiP7siginfoPv
 }
 {
    bug_333992
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN7content12_GLOBAL__N_123CreateWebFrameTestProxyEPNS_14RenderViewImplEi
    fun:_ZN7content15RenderFrameImpl6CreateEPNS_14RenderViewImplEi
 }