Remove suppressions for fixed sync leaks.

tools/heapcheck/suppressions.txt

Index: tools/heapcheck/suppressions.txt
diff --git a/tools/heapcheck/suppressions.txt b/tools/heapcheck/suppressions.txt
index 834064da9f23d9def6665638f4bba57ff4cf1421..c30f832ced9b4ffcf4eabeaa06e9a1ed50bfea34 100644
--- a/tools/heapcheck/suppressions.txt
+++ b/tools/heapcheck/suppressions.txt
@@ -929,58 +929,6 @@
    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}.
 {