Standardize usage of virtual/override/final in content/browser/

content/browser/quota_dispatcher_host.cc

Index: content/browser/quota_dispatcher_host.cc
diff --git a/content/browser/quota_dispatcher_host.cc b/content/browser/quota_dispatcher_host.cc
index ce7836225b7b6ceabd4262e6fd4e3339db163ed3..2ea8a5ec9b59a89792a8258ea74986703df43626 100644
--- a/content/browser/quota_dispatcher_host.cc
+++ b/content/browser/quota_dispatcher_host.cc
@@ -68,7 +68,7 @@ class QuotaDispatcherHost::QueryUsageAndQuotaDispatcher
       int request_id)
       : RequestDispatcher(dispatcher_host, request_id),
         weak_factory_(this) {}
-  virtual ~QueryUsageAndQuotaDispatcher() {}
+  ~QueryUsageAndQuotaDispatcher() override {}
 
   void QueryStorageUsageAndQuota(const GURL& origin, StorageType type) {
     quota_manager()->GetUsageAndQuotaForWebApps(
@@ -112,7 +112,7 @@ class QuotaDispatcherHost::RequestQuotaDispatcher
     // TODO(nhiroki): The backend should accept uint64 values.
     requested_quota_ = base::saturated_cast<int64>(params_.requested_size);
   }
-  virtual ~RequestQuotaDispatcher() {}
+  ~RequestQuotaDispatcher() override {}
 
   void Start() {
     DCHECK(dispatcher_host());