Standardize usage of virtual/override/final specifiers.

components/policy/core/common/cloud/cloud_policy_core_unittest.cc

Index: components/policy/core/common/cloud/cloud_policy_core_unittest.cc
diff --git a/components/policy/core/common/cloud/cloud_policy_core_unittest.cc b/components/policy/core/common/cloud/cloud_policy_core_unittest.cc
index 186cce60ff434270b545192464d0f5097d54dbe3..16372d5e8e8e5dde85ee5d16109056755f409bcb 100644
--- a/components/policy/core/common/cloud/cloud_policy_core_unittest.cc
+++ b/components/policy/core/common/cloud/cloud_policy_core_unittest.cc
@@ -35,9 +35,7 @@ class CloudPolicyCoreTest : public testing::Test,
     core_.AddObserver(this);
   }
 
-  virtual ~CloudPolicyCoreTest() {
-    core_.RemoveObserver(this);
-  }
+  ~CloudPolicyCoreTest() override { core_.RemoveObserver(this); }
 
   void OnCoreConnected(CloudPolicyCore* core) override {
     // Make sure core is connected at callback time.