[MemSheriff] More parseUA suppressions

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 # running overnight and removing outdated bugs/suppressions.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 211 matching lines @@
    FileStream::Context can leak through WorkerPool by design (CrOS)
    Heapcheck:Leak
    fun:FileStream
 }
 {
    Tasks posted to WorkerPool can leak by design
    Heapcheck:Leak
    fun:base::internal::PostTaskAndReplyImpl::PostTaskAndReply
    fun:base::WorkerPool::PostTaskAndReply
 }
+{
+   UA style sheets are intentionally leaked - see bug 121729
+   Heapcheck:Leak
+   ...
+   fun:parseUASheet
+}
 # This one pops out too often on different leaks and the stacks are very often
 # uninformative, e.g. don't include anything related to the bug.
 # TODO(earthdok): revisit what we want to do with _Rep when we have LSan.
 {
    basic_string::_Rep::_S_create
    Heapcheck:Leak
    fun:std::basic_string::_Rep::_S_create
    fun:std::basic_string::basic_string
 }
 
@@ skipping 645 matching lines @@
    fun:BrowserContextKeyedServiceFactory::GetServiceForBrowserContext
    fun:_init
    fun:BrowserContextDependencyManager::DoCreateBrowserContextServices
    fun:BrowserContextDependencyManager::CreateBrowserContextServicesForTest
    fun:TestingProfile::Init
    fun:TestingProfile::TestingProfile
    fun:AppKeepAliveServiceUnitTest::AppKeepAliveServiceUnitTest
    fun:AppKeepAliveServiceUnitTest_Basic_Test::AppKeepAliveServiceUnitTest_Basic_Test
    fun:testing::internal::TestFactoryImpl::CreateTest
 }