Remove suppressions for fixed sync leaks.

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 # running overnight and removing outdated bugs/suppressions.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 911 matching lines @@
    fun:net::HttpCache::Transaction::DoLoop
    fun:net::HttpCache::Transaction::Start
    fun:URLRequestHttpJob::StartTransaction
    fun:URLRequestHttpJob::OnCanGetCookiesCompleted
    fun:URLRequestHttpJob::AddCookieHeaderAndStart
    fun:URLRequestHttpJob::Start
    fun:URLRequest::StartJob
    fun:URLRequest::Start
    fun:HTTPTestServer::StartGETRequest
 }
-{
-   bug_50349
-   Heapcheck:Leak
-   ...
-   fun:syncable::Id::Id
-   fun:syncable::BaseTransaction::root_id
-}
-{
-   bug_50335
-   Heapcheck:Leak
-   ...
-   fun:syncable::MutableEntry::MutableEntry
-}
-
-# "*sync*" stands for {syncable,browser_sync}
-{
-   bug_50348
-   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:std::basic_string::basic_string
-   fun:*sync*::*Sync*_Test::TestBody
-}
-{
-   bug_50334
-   Heapcheck:Leak
-   ...
-   fun:google::protobuf::internal::ExtensionSet::MutableMessage
-   fun:google::protobuf::internal::ExtensionSet::MergeFrom
-   fun:sync_pb::EntitySpecifics::MergeFrom
-   fun:sync_pb::EntitySpecifics::CopyFrom
-   fun:syncable::EntryKernel::put
-   fun:syncable::MutableEntry::Put
-}
-{
-   bug_50336
-   Heapcheck:Leak
-   ...
-   fun:syncable::UnpackEntry
-   fun:syncable::DirectoryBackingStore::LoadEntries
-}
-
-{
-   bug_50347
-   Heapcheck:Leak
-   ...
-   fun:syncable::Id::CreateFromServerId
-   fun:browser_sync::TestIdFactory::*
-}
 
 # "Schedule*" stands for {ScheduleImmediately,ScheduleWithDelay}.
 {
    bug_50345
    Heapcheck:Leak
    ...
    fun:ScopedRunnableMethodFactory::NewRunnableMethod
    fun:sync_notifier::ChromeSystemResources::MakeTaskToPost
    fun:sync_notifier::ChromeSystemResources::Schedule*
    fun:sync_notifier::::ChromeSystemResourcesTest::ScheduleShouldNotRun
 }
 
 {
    bug_50484
    Heapcheck:Leak
    ...
    fun:SyncSetupWizard
    fun:ProfileSyncService
    fun:ProfileSyncServiceMock
    fun:NiceMock
    fun:TestingProfile::GetProfileSyncService
    fun:Profile::IsSyncAccessible
    fun:Browser::UpdateCommandsForFullscreenMode
    fun:Browser::InitCommandState
    fun:Browser
    fun:BrowserWithTestWindowTest::SetUp
 }