Reenable UnifiedHeapTest.TracedReferenceRetainsFromStack on Fuchsia

The test case was fixed in c7fbac6a

This reverts commit 34c0f0fc.

Bug: chromium:1278780
Change-Id: If04e41a7fc1f0c744fe785a834880e598f482ef8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3401592Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79201}

test/unittests/heap/cppgc-js/unified-heap-unittest.cc

@@ -131,7 +131,6 @@ TEST_F(UnifiedHeapTest, FreeUnreferencedDuringNoGcScope) {
 }
 #endif  // DEBUG
 
-#if !V8_OS_FUCHSIA
 TEST_F(UnifiedHeapTest, TracedReferenceRetainsFromStack) {
   v8::HandleScope handle_scope(v8_isolate());
   v8::Local<v8::Context> context = v8::Context::New(v8_isolate());
@@ -147,7 +146,6 @@ TEST_F(UnifiedHeapTest, TracedReferenceRetainsFromStack) {
   auto local = holder.Get(v8_isolate());
   EXPECT_TRUE(local->IsObject());
 }
-#endif  // !V8_OS_FUCHSIA
 
 TEST_F(UnifiedHeapDetachedTest, AllocationBeforeConfigureHeap) {
   auto heap = v8::CppHeap::Create(