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

content/browser/quota/mock_quota_manager_proxy.h

Index: content/browser/quota/mock_quota_manager_proxy.h
diff --git a/content/browser/quota/mock_quota_manager_proxy.h b/content/browser/quota/mock_quota_manager_proxy.h
index 23accc8f42e13dc28dad81454fdbe1eaaa3ff010..0f52f6dcc8e860a8e337f7dccfd174c37f6ce787 100644
--- a/content/browser/quota/mock_quota_manager_proxy.h
+++ b/content/browser/quota/mock_quota_manager_proxy.h
@@ -23,18 +23,18 @@ class MockQuotaManagerProxy : public QuotaManagerProxy {
   MockQuotaManagerProxy(MockQuotaManager* quota_manager,
                         base::SingleThreadTaskRunner* task_runner);
 
-  virtual void RegisterClient(QuotaClient* client) override;
+  void RegisterClient(QuotaClient* client) override;
 
   void SimulateQuotaManagerDestroyed();
 
   // We don't mock them.
-  virtual void NotifyOriginInUse(const GURL& origin) override {}
-  virtual void NotifyOriginNoLongerInUse(const GURL& origin) override {}
-  virtual void SetUsageCacheEnabled(QuotaClient::ID client_id,
-                                    const GURL& origin,
-                                    StorageType type,
-                                    bool enabled) override {}
-  virtual void GetUsageAndQuota(
+  void NotifyOriginInUse(const GURL& origin) override {}
+  void NotifyOriginNoLongerInUse(const GURL& origin) override {}
+  void SetUsageCacheEnabled(QuotaClient::ID client_id,
+                            const GURL& origin,
+                            StorageType type,
+                            bool enabled) override {}
+  void GetUsageAndQuota(
       base::SequencedTaskRunner* original_task_runner,
       const GURL& origin,
       StorageType type,
@@ -44,18 +44,18 @@ class MockQuotaManagerProxy : public QuotaManagerProxy {
   // which can be accessed via notify_storage_accessed_count().
   // The also records the |origin| and |type| in last_notified_origin_ and
   // last_notified_type_.
-  virtual void NotifyStorageAccessed(QuotaClient::ID client_id,
-                                     const GURL& origin,
-                                     StorageType type) override;
+  void NotifyStorageAccessed(QuotaClient::ID client_id,
+                             const GURL& origin,
+                             StorageType type) override;
 
   // Records the |origin|, |type| and |delta| as last_notified_origin_,
   // last_notified_type_ and last_notified_delta_ respecitvely.
   // If non-null MockQuotaManager is given to the constructor this also
   // updates the manager's internal usage information.
-  virtual void NotifyStorageModified(QuotaClient::ID client_id,
-                                     const GURL& origin,
-                                     StorageType type,
-                                     int64 delta) override;
+  void NotifyStorageModified(QuotaClient::ID client_id,
+                             const GURL& origin,
+                             StorageType type,
+                             int64 delta) override;
 
   int notify_storage_accessed_count() const { return storage_accessed_count_; }
   int notify_storage_modified_count() const { return storage_modified_count_; }
@@ -64,7 +64,7 @@ class MockQuotaManagerProxy : public QuotaManagerProxy {
   int64 last_notified_delta() const { return last_notified_delta_; }
 
  protected:
-  virtual ~MockQuotaManagerProxy();
+  ~MockQuotaManagerProxy() override;
 
  private:
   MockQuotaManager* mock_manager() const {