[test][cppgc] Remove NOLINT because of virtual+override

'override' implies 'virtual', thus 'virtual' should be skipped.

R=mlippautz@chromium.org

Bug: v8:11717
Change-Id: If5e9c2aeec85fcf0832f9712b6e09752c4d2c2d3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2878737Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74432}

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

@@ -36,11 +36,9 @@ class MockTaskRunner : public cppgc::TaskRunner {
   MOCK_METHOD(void, PostIdleTask, (std::unique_ptr<cppgc::IdleTask>),
               (override));
 
-  virtual bool IdleTasksEnabled() override { return true; }       // NOLINT
-  bool NonNestableTasksEnabled() const override { return true; }  // NOLINT
-  virtual bool NonNestableDelayedTasksEnabled() const override {  // NOLINT
-    return true;
-  }
+  bool IdleTasksEnabled() override { return true; }
+  bool NonNestableTasksEnabled() const override { return true; }
+  bool NonNestableDelayedTasksEnabled() const override { return true; }
 };
 
 class MockPlatform : public cppgc::Platform {