Standardize usage of virtual/override/final specifiers.

chrome/browser/sync/test/integration/migration_test.cc

Index: chrome/browser/sync/test/integration/migration_test.cc
diff --git a/chrome/browser/sync/test/integration/migration_test.cc b/chrome/browser/sync/test/integration/migration_test.cc
index ef2ac1ec43fa88065974b225ec3551b375394f66..753865e8a1f3e37e38f54a74d7ed651957ee7edd 100644
--- a/chrome/browser/sync/test/integration/migration_test.cc
+++ b/chrome/browser/sync/test/integration/migration_test.cc
@@ -70,7 +70,7 @@ MigrationList MakeList(syncer::ModelType type1,
 class MigrationTest : public SyncTest  {
  public:
   explicit MigrationTest(TestType test_type) : SyncTest(test_type) {}
-  virtual ~MigrationTest() {}
+  ~MigrationTest() override {}
 
   enum TriggerMethod { MODIFY_PREF, MODIFY_BOOKMARK, TRIGGER_NOTIFICATION };
 
@@ -216,7 +216,7 @@ class MigrationTest : public SyncTest  {
 class MigrationSingleClientTest : public MigrationTest {
  public:
   MigrationSingleClientTest() : MigrationTest(SINGLE_CLIENT_LEGACY) {}
-  virtual ~MigrationSingleClientTest() {}
+  ~MigrationSingleClientTest() override {}
 
   void RunSingleClientMigrationTest(const MigrationList& migration_list,
                                     TriggerMethod trigger_method) {
@@ -341,7 +341,7 @@ IN_PROC_BROWSER_TEST_F(MigrationSingleClientTest, AllTypesWithNigoriAtOnce) {
 class MigrationTwoClientTest : public MigrationTest {
  public:
   MigrationTwoClientTest() : MigrationTest(TWO_CLIENT_LEGACY) {}
-  virtual ~MigrationTwoClientTest() {}
+  ~MigrationTwoClientTest() override {}
 
   // Helper function that verifies that preferences sync still works.
   void VerifyPrefSync() {
@@ -426,7 +426,7 @@ class MigrationReconfigureTest : public MigrationTwoClientTest {
     // Do not add optional datatypes.
   }
 
-  virtual ~MigrationReconfigureTest() {}
+  ~MigrationReconfigureTest() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MigrationReconfigureTest);