Revert of Disable the CompilerDispatcher if we don't have idle time

test/unittests/compiler-dispatcher/compiler-dispatcher-unittest.cc

Index: test/unittests/compiler-dispatcher/compiler-dispatcher-unittest.cc
diff --git a/test/unittests/compiler-dispatcher/compiler-dispatcher-unittest.cc b/test/unittests/compiler-dispatcher/compiler-dispatcher-unittest.cc
index 7f6cfc0e8db2d47d1a44cbd1d7382903895f3437..a2046a4da82f22b1134bbe90fa4b94731ea42958 100644
--- a/test/unittests/compiler-dispatcher/compiler-dispatcher-unittest.cc
+++ b/test/unittests/compiler-dispatcher/compiler-dispatcher-unittest.cc
@@ -16,30 +16,7 @@
 namespace v8 {
 namespace internal {
 
-class CompilerDispatcherTest : public TestWithContext {
- public:
-  CompilerDispatcherTest() = default;
-  ~CompilerDispatcherTest() override = default;
-
-  static void SetUpTestCase() {
-    old_flag_ = i::FLAG_ignition;
-    i::FLAG_ignition = true;
-    i::FLAG_compiler_dispatcher = true;
-    TestWithContext::SetUpTestCase();
-  }
-
-  static void TearDownTestCase() {
-    TestWithContext::TearDownTestCase();
-    i::FLAG_ignition = old_flag_;
-  }
-
- private:
-  static bool old_flag_;
-
-  DISALLOW_COPY_AND_ASSIGN(CompilerDispatcherTest);
-};
-
-bool CompilerDispatcherTest::old_flag_;
+typedef TestWithContext CompilerDispatcherTest;
 
 namespace {