Standardize usage of virtual/override/final specifiers.

extensions/browser/api/power/power_api_unittest.cc

Index: extensions/browser/api/power/power_api_unittest.cc
diff --git a/extensions/browser/api/power/power_api_unittest.cc b/extensions/browser/api/power/power_api_unittest.cc
index af44d30c523fd933b3cba51a45577969047c83a5..3e7d8d4f3369aef4cf26ee15f93a23586cd81444 100644
--- a/extensions/browser/api/power/power_api_unittest.cc
+++ b/extensions/browser/api/power/power_api_unittest.cc
@@ -128,12 +128,12 @@ class PowerSaveBlockerStubManager {
 
 class PowerApiTest : public ApiUnitTest {
  public:
-  virtual void SetUp() override {
+  void SetUp() override {
     ApiUnitTest::SetUp();
     manager_.reset(new PowerSaveBlockerStubManager(browser_context()));
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     manager_.reset();
     ApiUnitTest::TearDown();
   }