Standardize usage of virtual/override/final in chrome/browser/sync/

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

Index: chrome/browser/sync/test/integration/sessions_helper.cc
diff --git a/chrome/browser/sync/test/integration/sessions_helper.cc b/chrome/browser/sync/test/integration/sessions_helper.cc
index 8f9b1804aff4f337263d56c7e9fd4d2d0ba7ad71..6ab0e678236bbeb0d3799d332e4c4ad7fa580203 100644
--- a/chrome/browser/sync/test/integration/sessions_helper.cc
+++ b/chrome/browser/sync/test/integration/sessions_helper.cc
@@ -136,7 +136,7 @@ class TabEventHandler : public browser_sync::LocalSessionEventHandler {
         TestTimeouts::action_max_timeout());
   }
 
-  virtual void OnLocalTabModified(
+  void OnLocalTabModified(
       browser_sync::SyncedTabDelegate* modified_tab) override {
     // Unwind to ensure SessionsSyncManager has processed the event.
     base::MessageLoop::current()->PostTask(
@@ -144,7 +144,7 @@ class TabEventHandler : public browser_sync::LocalSessionEventHandler {
         base::Bind(&TabEventHandler::QuitLoop, weak_factory_.GetWeakPtr()));
   }
 
-  virtual void OnFaviconPageUrlsUpdated(
+  void OnFaviconPageUrlsUpdated(
       const std::set<GURL>& updated_page_urls) override {
     // Unwind to ensure SessionsSyncManager has processed the event.
     base::MessageLoop::current()->PostTask(
@@ -367,10 +367,11 @@ class CheckForeignSessionsChecker : public MultiClientStatusChangeChecker {
  public:
   CheckForeignSessionsChecker(int index,
                               const std::vector<ScopedWindowMap>& windows);
-  virtual ~CheckForeignSessionsChecker();
+  ~CheckForeignSessionsChecker() override;
+
+  bool IsExitConditionSatisfied() override;
+  std::string GetDebugMessage() const override;
 
-  virtual bool IsExitConditionSatisfied() override;
-  virtual std::string GetDebugMessage() const override;
  private:
   int index_;
   const std::vector<ScopedWindowMap>& windows_;