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

chrome/browser/task_manager/task_manager_browsertest_util.cc

Index: chrome/browser/task_manager/task_manager_browsertest_util.cc
diff --git a/chrome/browser/task_manager/task_manager_browsertest_util.cc b/chrome/browser/task_manager/task_manager_browsertest_util.cc
index fce4ae4a9593f49ab0b17d0db0a1cecb890828d7..6ece5a4cdd645234ece82236ee2f4d7a6e091c27 100644
--- a/chrome/browser/task_manager/task_manager_browsertest_util.cc
+++ b/chrome/browser/task_manager/task_manager_browsertest_util.cc
@@ -34,21 +34,13 @@ class ResourceChangeObserver : public TaskManagerModelObserver {
         required_count_(required_count),
         title_pattern_(title_pattern) {}
 
-  virtual void OnModelChanged() override {
-    OnResourceChange();
-  }
+  void OnModelChanged() override { OnResourceChange(); }
 
-  virtual void OnItemsChanged(int start, int length) override {
-    OnResourceChange();
-  }
+  void OnItemsChanged(int start, int length) override { OnResourceChange(); }
 
-  virtual void OnItemsAdded(int start, int length) override {
-    OnResourceChange();
-  }
+  void OnItemsAdded(int start, int length) override { OnResourceChange(); }
 
-  virtual void OnItemsRemoved(int start, int length) override {
-    OnResourceChange();
-  }
+  void OnItemsRemoved(int start, int length) override { OnResourceChange(); }
 
   void RunUntilSatisfied() {
     // See if the condition is satisfied without having to run the loop. This