cppgc: Replace SetUp/TearDown with ctor/dtor

Change-Id: I8a8ce7008887f807726ddafdbd8048b64e1e1b84
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2867472
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74332}

test/unittests/heap/cppgc/gc-info-unittest.cc

@@ -22,18 +22,14 @@ constexpr GCInfo GetEmptyGCInfo() { return {nullptr, nullptr, nullptr, false}; }
 
 class GCInfoTableTest : public ::testing::Test {
  public:
+  GCInfoTableTest() : table_(std::make_unique<GCInfoTable>(&page_allocator_)) {}
+
   GCInfoIndex RegisterNewGCInfoForTesting(const GCInfo& info) {
     // Unused registered index will result in registering a new index.
     std::atomic<GCInfoIndex> registered_index{0};
     return table().RegisterNewGCInfo(registered_index, info);
   }
 
-  void SetUp() override {
-    table_ = std::make_unique<GCInfoTable>(&page_allocator_);
-  }
-
-  void TearDown() override { table_.reset(); }
-
   GCInfoTable& table() { return *table_; }
   const GCInfoTable& table() const { return *table_; }
 

test/unittests/heap/cppgc/stack-unittest.cc

@@ -24,12 +24,9 @@ using heap::base::StackVisitor;
 namespace {
 
 class GCStackTest : public ::testing::Test {
- protected:
-  void SetUp() override {
-    stack_.reset(new Stack(v8::base::Stack::GetStackStart()));
-  }
-
-  void TearDown() override { stack_.reset(); }
+ public:
+  GCStackTest()
+      : stack_(std::make_unique<Stack>(v8::base::Stack::GetStackStart())) {}
 
   Stack* GetStack() const { return stack_.get(); }
 
@@ -111,7 +108,7 @@ namespace {
 // Prevent inlining as that would allow the compiler to prove that the parameter
 // must not actually be materialized.
 //
-// Parameter positiosn are explicit to test various calling conventions.
+// Parameter positions are explicit to test various calling conventions.
 V8_NOINLINE void* RecursivelyPassOnParameterImpl(void* p1, void* p2, void* p3,
                                                  void* p4, void* p5, void* p6,
                                                  void* p7, void* p8,