Remove trailing semicolon at the end of a method definition

ash/display/display_manager_unittest.cc

Index: ash/display/display_manager_unittest.cc
diff --git a/ash/display/display_manager_unittest.cc b/ash/display/display_manager_unittest.cc
index 11990bc680831ba57f4d273d40fec412ec8081f5..924f2148278ae1bfc63eb93cb8839471249b2212 100644
--- a/ash/display/display_manager_unittest.cc
+++ b/ash/display/display_manager_unittest.cc
@@ -2960,7 +2960,7 @@ class DisplayManagerOrientationTest : public DisplayManagerTest {
 class TestObserver : public ScreenOrientationController::Observer {
  public:
   TestObserver() {}
-  ~TestObserver() override{};
+  ~TestObserver() override {}
 
   void OnUserRotationLockChanged() override { count_++; }