Fix compilation failure due to overload of virtual function

test/unittests/value-serializer-unittest.cc

Index: test/unittests/value-serializer-unittest.cc
diff --git a/test/unittests/value-serializer-unittest.cc b/test/unittests/value-serializer-unittest.cc
index 7ca7433eebc1de8f0f4fa503b94f89692c33b239..26685fb2f9140bad9040b7ca33a6eadce8730392 100644
--- a/test/unittests/value-serializer-unittest.cc
+++ b/test/unittests/value-serializer-unittest.cc
@@ -1894,7 +1894,11 @@ class OOMArrayBufferAllocator : public ArrayBuffer::Allocator {
  public:
   void* Allocate(size_t) override { return nullptr; }
   void* AllocateUninitialized(size_t) override { return nullptr; }
+  void* Reserve(size_t length) override { return nullptr; }
+  void Free(void* data, size_t length, AllocationMode mode) override {}
   void Free(void*, size_t) override {}
+  void SetProtection(void* data, size_t length,
+                     Protection protection) override {}
 };
 
 TEST_F(ValueSerializerTest, DecodeArrayBufferOOM) {