Valgrind/Heapchecker: Remove obsolete suppressions for a BackgroundApplicationListModelTest that no…

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 # running overnight and removing outdated bugs/suppressions.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 687 matching lines @@
 }
 {
    bug_71909
    Heapcheck:Leak
    fun:TestingProfile::CreateRequestContext
    fun:MockService
    ...
    fun:ExtensionUpdaterTest*
 }
 {
-   bug_73358
-   Heapcheck:Leak
-   fun:TestingProfile::GetRequestContextForExtensions
-   fun:ExtensionDataDeleter
-   fun:ExtensionService::ClearExtensionData
-   fun:ExtensionService::UninstallExtension
-   fun:BackgroundApplicationListModelTest_Load*Extension*_Test::TestBody
-}
-{
    bug_79322a
    Heapcheck:Leak
    fun:__gnu_cxx::new_allocator::allocate
    fun:std::string::_Rep::_S_create
    fun:std::string::_S_construct
    fun:std::string::_S_construct_aux
    fun:std::string::_S_construct
    fun:*basic_string*
    fun:AutofillMetrics::Log
 }
@@ skipping 768 matching lines @@
    fun:std::basic_string::_Rep::_S_create
    ...
    fun:base::PlatformThread::SetName
 }
 {
    bug_139635
    Heapcheck:Leak
    fun:syncer::JsSyncManagerObserver::OnInitializationComplete
    fun:syncer::::JsSyncManagerObserverTest_OnInitializationComplete_Test::TestBody
 }