[Memory Sheriff] Suppression for URLRequestFtpJob

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 # running overnight and removing outdated bugs/suppressions.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 1832 matching lines @@
    ...
    fun:DiskCacheTestWithCache::InitCache
    fun:DiskCacheBackendTest_SimpleDoom*
 }
 {
    bug_236791
    Heapcheck:Leak
    ...
    fun:ash::test::FocusCyclerTest_CycleFocusThroughWindowWithPanes_Test::TestBody
 }
+{
+   bug_238339
+   Heapcheck:Leak
+   ...
+   fun:net::ProxyService::ResolveProxy
+   fun:net::URLRequestFtpJob::Start
+   fun:net::URLRequest::StartJob
+   fun:net::URLRequest::BeforeRequestComplete
+   fun:net::URLRequest::Start
+}