Remove an outdated Notification leak suppression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 # running overnight and removing outdated bugs/suppressions.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 1676 matching lines @@
    bug_145708
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN27ExtensionDevToolsClientHostC1EPN7content11WebContentsERKSsS4_i
    fun:_ZN22AttachDebuggerFunction7RunImplEv
    fun:_ZN17ExtensionFunction3RunEv
    fun:_ZN27ExtensionFunctionDispatcher8DispatchERK31ExtensionHostMsg_Request_ParamsPN7content14RenderViewHostE
    fun:_ZN10extensions13ExtensionHost9OnRequestERK31ExtensionHostMsg_Request_Params
 }
 {
-   bug_145712
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN5blink25NotificationPresenterImpl17requestPermissionEPN7blink22ScriptExecutionContextEN3WTF10PassRefPtrINS1_12VoidCallbackEEE
-   fun:_ZN5blink18NotificationCenter17requestPermissionEN3WTF10PassRefPtrINS_12VoidCallbackEEE
-   fun:_ZN5blink20V8NotificationCenter25requestPermissionCallbackERKN2v89ArgumentsE
-}
-{
    bug_145723
    Memcheck:Leak
    fun:_Znw*
    fun:_Z20NewExtensionFunctionI25TabsExecuteScriptFunctionEP17ExtensionFunctionv
    fun:_ZN25ExtensionFunctionRegistry11NewFunctionERKSs
    fun:_ZN27ExtensionFunctionDispatcher23CreateExtensionFunctionERK31ExtensionHostMsg_Request_ParamsPKN10extensions9ExtensionEiRKNS3_10ProcessMapEPNS3_12ExtensionAPIEPvPN3IPC6SenderEPN7content14RenderViewHostEi
    fun:_ZN27ExtensionFunctionDispatcher8DispatchERK31ExtensionHostMsg_Request_ParamsPN7content14RenderViewHostE
    fun:_ZN10extensions13ExtensionHost9OnRequestERK31ExtensionHostMsg_Request_Params
 }
 {
@@ skipping 1776 matching lines @@
    fun:_Znw*
    fun:_ZN9__gnu_cxx13new_allocatorIPN10disk_cache20SimpleEntryOperationEE8allocateEmPKv
    fun:_ZNSt11_Deque_baseIN10disk_cache20SimpleEntryOperationESaIS1_EE15_M_allocate_mapEm
    fun:_ZNSt11_Deque_baseIN10disk_cache20SimpleEntryOperationESaIS1_EE17_M_initialize_mapEm
    fun:_ZNSt11_Deque_baseIN10disk_cache20SimpleEntryOperationESaIS1_EEC2Ev
    fun:_ZNSt5dequeIN10disk_cache20SimpleEntryOperationESaIS1_EEC2Ev
    fun:_ZN10disk_cache15SimpleEntryImplC1EN3net9CacheTypeERKN4base8FilePathEmNS0_14OperationsModeEPNS_17SimpleBackendImplEPNS1_6NetLogE
    fun:_ZN10disk_cache17SimpleBackendImpl23CreateOrFindActiveEntryEmRKSs
    fun:_ZN10disk_cache17SimpleBackendImpl11CreateEntryERKSsPPNS_5EntryERKN4base8CallbackIFviEEE
 }