[wasm] Exported memory should set maximum property when maximum is defined.

src/wasm/wasm-js.cc

Index: src/wasm/wasm-js.cc
diff --git a/src/wasm/wasm-js.cc b/src/wasm/wasm-js.cc
index 36ffed223da101b0ba8cd44bc8b63c1f837f69ea..60f33f9e4c6b7c4220addb4e02b98ce11e27b10d 100644
--- a/src/wasm/wasm-js.cc
+++ b/src/wasm/wasm-js.cc
@@ -910,7 +910,7 @@ uint32_t WasmJs::GetWasmMemoryMaximumSize(Isolate* isolate,
   DCHECK(IsWasmMemoryObject(isolate, value));
   Object* max_mem =
       JSObject::cast(*value)->GetInternalField(kWasmMemoryMaximum);
-  if (max_mem->IsUndefined(isolate)) return wasm::WasmModule::kV8MaxPages;
+  if (max_mem->IsUndefined(isolate)) return 0;
   uint32_t max_pages = Smi::cast(max_mem)->value();
   return max_pages;
 }