Add leak expectation for module WPT

third_party/WebKit/LayoutTests/LeakExpectations

Index: third_party/WebKit/LayoutTests/LeakExpectations
diff --git a/third_party/WebKit/LayoutTests/LeakExpectations b/third_party/WebKit/LayoutTests/LeakExpectations
index bb2608f57e0122b133fdcc6ce76654dede4bb9fd..cb4ec076e625ccee58d19561b7a3841c6867eda6 100644
--- a/third_party/WebKit/LayoutTests/LeakExpectations
+++ b/third_party/WebKit/LayoutTests/LeakExpectations
@@ -140,6 +140,8 @@ crbug.com/672740 virtual/mojo-loading/http/tests/security/mixedContent/websocket
 crbug.com/674858 [ Linux ] virtual/threaded/printing/offscreencanvas-2d-printing.html [ Pass Crash ]
 crbug.com/674858 [ Linux ] virtual/threaded/printing/offscreencanvas-webgl-printing.html [ Pass Crash ]
 
+# Sheriff: Commit causing leak found but non-trivial to revert
+crbug.com/718114 [ Linux ] external/wpt/html/semantics/scripting-1/the-script-element/module/crossorigin.html [ Leak Failure ]
 
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 # WARNING: Memory leaks must be fixed asap. Sheriff is expected to revert #