Standardize usage of virtual/override/final in components/

components/dom_distiller/core/dom_distiller_store_unittest.cc

Index: components/dom_distiller/core/dom_distiller_store_unittest.cc
diff --git a/components/dom_distiller/core/dom_distiller_store_unittest.cc b/components/dom_distiller/core/dom_distiller_store_unittest.cc
index b7ebfb3a6b69a00960658a1e0de02ca5fb2885c7..b84f2b0d13082471b1ba393505c9f9eeaa5e1751 100644
--- a/components/dom_distiller/core/dom_distiller_store_unittest.cc
+++ b/components/dom_distiller/core/dom_distiller_store_unittest.cc
@@ -48,7 +48,7 @@ void AddEntry(const ArticleEntry& e, EntryMap* map) {
 
 class FakeSyncErrorFactory : public syncer::SyncErrorFactory {
  public:
-  virtual syncer::SyncError CreateAndUploadError(
+  syncer::SyncError CreateAndUploadError(
       const tracked_objects::Location& location,
       const std::string& message) override {
     return syncer::SyncError();
@@ -59,15 +59,13 @@ class FakeSyncChangeProcessor : public syncer::SyncChangeProcessor {
  public:
   explicit FakeSyncChangeProcessor(EntryMap* model) : model_(model) {}
 
-  virtual syncer::SyncDataList GetAllSyncData(
-      syncer::ModelType type) const override {
+  syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const override {
     ADD_FAILURE() << "FakeSyncChangeProcessor::GetAllSyncData not implemented.";
     return syncer::SyncDataList();
   }
 
-  virtual SyncError ProcessSyncChanges(
-      const tracked_objects::Location&,
-      const syncer::SyncChangeList& changes) override {
+  SyncError ProcessSyncChanges(const tracked_objects::Location&,
+                               const syncer::SyncChangeList& changes) override {
     for (SyncChangeList::const_iterator it = changes.begin();
          it != changes.end(); ++it) {
       AddEntry(GetEntryFromChange(*it), model_);