Mark wasm_serialization_tests.html as possibly failing while a V8-side change lands.

third_party/WebKit/LayoutTests/TestExpectations

Index: third_party/WebKit/LayoutTests/TestExpectations
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index 489d3246640f4cc04911f5370eebfc0825996be8..97193312e6b6bdfb32ace29135bb1efd7dd0225a 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -2326,6 +2326,8 @@ crbug.com/680050 inspector/sources/debugger-ui/watch-expressions-panel-switch.ht
 # When WebAssembly is exposed in V8 (soon), this test has the wrong number of expected Object.getOwnPropertyNames() for global object.
 crbug.com/575167 external/wpt/html/browsers/origin/cross-origin-objects/cross-origin-objects-exceptions.html [ NeedsManualRebaseline ]
 
+crbug.com/685713 virtual/enable_wasm/http/tests/wasm/wasm_serialization_tests.html [ Pass Failure ]
+
 crbug.com/681468 fast/forms/suggestion-picker/date-suggestion-picker-appearance-zoom125.html [ Failure Pass ]
 crbug.com/681468 fast/forms/suggestion-picker/date-suggestion-picker-appearance-zoom200.html [ Failure Pass ]