[MemSheriff] Suppress leak in content::ServiceWorkerContextWrapper

tools/valgrind/memcheck/suppressions.txt

 # There are four 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 # running overnight and removing outdated bugs/suppressions.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 3409 matching lines @@
    fun:_ZN7content21RenderProcessHostImpl20CreateMessageFiltersEv
    fun:_ZN7content21RenderProcessHostImpl4InitEv
    fun:_ZN7content22RenderFrameHostManager14InitRenderViewEPNS_18RenderViewHostImplEPNS_20RenderFrameProxyHostE
 }
 {
    bug_557778
    Memcheck:Uninitialized
    fun:vp9_pick_inter_mode
    fun:nonrd_pick_sb_modes
 }
+{
+   bug_558179
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN7content27ServiceWorkerContextWrapperC1EPNS_14BrowserContextE
+   fun:_ZN7content20StoragePartitionImpl6CreateEPNS_14BrowserContextEbRKN4base8FilePathE
+   fun:_ZN7content23StoragePartitionImplMap3GetERKSsS2_b
+   fun:_ZN7content12_GLOBAL__N_129GetStoragePartitionFromConfigEPNS_14BrowserContextERKSsS4_b
+   fun:_ZN7content14BrowserContext26GetStoragePartitionForSiteEPS0_RK4GURL
+}