Leaks reported in disk_cache::BackendIO

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 # running overnight and removing outdated bugs/suppressions.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 1811 matching lines @@
 }
 {
    bug_227271b
    Heapcheck:Leak
    fun:std::basic_string::_Rep::_S_create
    fun:base::FilePath::Append
    fun:base::FilePath::AppendASCII
    fun:ScreenshotTaker::HandleTakePartialScreenshot
    fun:ash::test::ScreenshotTakerTest_TakeScreenshot_Test::TestBody
 }
+{
+   bug_227301a
+   Heapcheck:Leak
+   fun:base::internal::WeakReferenceOwner::GetRef
+   fun:base::WeakPtrFactory::GetWeakPtr
+   fun:disk_cache::InFlightBackendIO::GetWeakPtr
+   fun:disk_cache::BackendImpl::GetBackgroundQueue
+   fun:disk_cache::EntryImpl::OnEntryCreated
+   fun:disk_cache::BackendIO::OnDone
+   fun:disk_cache::InFlightBackendIO::OnOperationComplete
+   fun:disk_cache::InFlightIO::InvokeCallback
+   fun:disk_cache::BackgroundIO::OnIOSignalled
+}
+{
+   bug_227301b
+   Heapcheck:Leak
+   ...
+   fun:disk_cache::EntryImpl::PrepareTarget
+   fun:disk_cache::EntryImpl::InternalWriteData
+   fun:disk_cache::EntryImpl::WriteDataImpl
+   fun:disk_cache::BackendIO::ExecuteEntryOperation
+   fun:disk_cache::BackendIO::ExecuteOperation
+}