replace newly added OVERRIDEs with override in chrome/browser/history/

BUG=417463

Review URL: https://codereview.chromium.org/652103003

Cr-Commit-Position: refs/heads/master@{#300085}

chrome/browser/history/android/android_provider_backend_unittest.cc

@@ -79,7 +79,7 @@ class AndroidProviderBackendDelegate : public HistoryBackend::Delegate {
   virtual void NotifyURLVisited(ui::PageTransition,
                                 const history::URLRow& row,
                                 const history::RedirectList& redirects,
-                                base::Time visit_time) OVERRIDE {}
+                                base::Time visit_time) override {}
   virtual void BroadcastNotifications(
       int type,
       scoped_ptr<HistoryDetails> details) override {

chrome/browser/history/chrome_history_client.h

@@ -50,7 +50,7 @@ class ChromeHistoryClient : public history::HistoryClient,
                             ui::PageTransition transition,
                             const history::URLRow& row,
                             const history::RedirectList& redirects,
-                            base::Time visit_time) OVERRIDE;
+                            base::Time visit_time) override;
 
   // TopSitesObserver:
   virtual void TopSitesLoaded(history::TopSites* top_sites) override;

chrome/browser/history/history_service.cc

@@ -176,7 +176,7 @@ class HistoryService::BackendDelegate : public HistoryBackend::Delegate {
   virtual void NotifyURLVisited(ui::PageTransition transition,
                                 const history::URLRow& row,
                                 const history::RedirectList& redirects,
-                                base::Time visit_time) OVERRIDE {
+                                base::Time visit_time) override {
     service_task_runner_->PostTask(FROM_HERE,
                                    base::Bind(&HistoryService::NotifyURLVisited,
                                               history_service_,

chrome/browser/history/in_memory_history_backend.h

@@ -78,7 +78,7 @@ class InMemoryHistoryBackend : public HistoryServiceObserver,
                             ui::PageTransition transition,
                             const URLRow& row,
                             const RedirectList& redirects,
-                            base::Time visit_time) OVERRIDE;
+                            base::Time visit_time) override;
 
   // Notification callback.
   virtual void Observe(int type,

chrome/browser/history/in_memory_url_index.h

@@ -245,7 +245,7 @@ class InMemoryURLIndex : public HistoryServiceObserver,
                             ui::PageTransition transition,
                             const URLRow& row,
                             const RedirectList& redirects,
-                            base::Time visit_time) OVERRIDE;
+                            base::Time visit_time) override;
 
   // Notification handlers.
   void OnURLsModified(const URLsModifiedDetails* details);