Standardize usage of virtual/override/final specifiers in sync/.

sync/engine/get_updates_processor_unittest.cc

Index: sync/engine/get_updates_processor_unittest.cc
diff --git a/sync/engine/get_updates_processor_unittest.cc b/sync/engine/get_updates_processor_unittest.cc
index c146c56baf83a5e082d5136d5eb6a5749c569dc8..566a295c92d39df12804d0b89c070a40d044165a 100644
--- a/sync/engine/get_updates_processor_unittest.cc
+++ b/sync/engine/get_updates_processor_unittest.cc
@@ -40,7 +40,7 @@ class GetUpdatesProcessorTest : public ::testing::Test {
     kTestStartTime(base::TimeTicks::Now()),
     update_handler_deleter_(&update_handler_map_) {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     AddUpdateHandler(AUTOFILL);
     AddUpdateHandler(BOOKMARKS);
     AddUpdateHandler(PREFERENCES);
@@ -386,9 +386,9 @@ TEST_F(GetUpdatesProcessorTest, NormalResponseTest) {
 class GetUpdatesProcessorApplyUpdatesTest : public GetUpdatesProcessorTest {
  public:
   GetUpdatesProcessorApplyUpdatesTest() {}
-  virtual ~GetUpdatesProcessorApplyUpdatesTest() {}
+  ~GetUpdatesProcessorApplyUpdatesTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     bookmarks_handler_ = AddUpdateHandler(BOOKMARKS);
     autofill_handler_ = AddUpdateHandler(AUTOFILL);
   }
@@ -475,7 +475,7 @@ TEST_F(GetUpdatesProcessorApplyUpdatesTest, Poll) {
 class DownloadUpdatesDebugInfoTest : public ::testing::Test {
  public:
   DownloadUpdatesDebugInfoTest() {}
-  virtual ~DownloadUpdatesDebugInfoTest() {}
+  ~DownloadUpdatesDebugInfoTest() override {}
 
   sessions::StatusController* status() {
     return &status_;