Remove suppressions related to App Notifications

tools/heapcheck/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 # running overnight and removing outdated bugs/suppressions.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 974 matching lines @@
    fun:syncer::NonBlockingInvalidationNotifier::Core::UpdateCredentials
    fun:void DispatchToMethod
 }
 {
    bug_98967
    Heapcheck:Leak
    ...
    fun:V8ValueConverterImplTest_WeirdTypes_Test::TestBody
 }
 {
-   bug_99166_a
-   Heapcheck:Leak
-   ...
-   fun:AppNotificationStorage::Create
-}
-{
-   bug_99166_b
-   Heapcheck:Leak
-   ...
-   fun:AppNotificationManager::Init
-}
-{
    bug_99304
    Heapcheck:Leak
    fun:v8::internal::SkipList::Update
    fun:v8::internal::PagedSpace::AllocateRaw
    fun:v8::internal::Heap::ReserveSpace
    fun:v8::internal::Deserializer::Deserialize
    fun:v8::internal::Isolate::Init
    fun:v8::internal::V8::Initialize
    fun:v8::internal::Snapshot::Initialize
    fun:*InitializeHelper
@@ skipping 823 matching lines @@
    fun:ExtensionService::ExtensionService
    fun:extensions::TestExtensionSystem::CreateExtensionService
    fun:ProfileSigninConfirmationDialogTest::SetUp
 }
 {
    bug_189194_b
    Heapcheck:Leak
    ...
    fun:ProfileSigninConfirmationDialogTest_*_Test::TestBody
 }