Valgrind: Supress a leak in ServiceWorkerContextWrapper.

BUG=369843
TBR=groby@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/264043003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@268093 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -6380,3 +6380,9 @@
    fun:_ZN4mojo9RemotePtrINS_11ShellClientEE5resetENS_16ScopedHandleBaseINS_15InterfaceHandleIS1_EEEEPNS_5ShellEPNS_12ErrorHandlerEP15MojoAsyncWaiter
    fun:_ZN7content19MojoApplicationHost4InitEv
 }
+{
+   bug_369843
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN7content27ServiceWorkerContextWrapper12InitInternalERKN4base8FilePathEPNS1_19SequencedTaskRunnerEPN5quota17QuotaManagerProxyE
+}