Standardize usage of virtual/override/final in extensions/

extensions/browser/stash_backend.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/stash_backend.h"
 
 namespace extensions {
 
 // An implementation of StashService that forwards calls to a StashBackend.
 class StashServiceImpl : public mojo::InterfaceImpl<StashService> {
  public:
   explicit StashServiceImpl(base::WeakPtr<StashBackend> backend);
-  virtual ~StashServiceImpl();
+  ~StashServiceImpl() override;
 
   // mojo::InterfaceImpl<StashService> overrides.
-  virtual void AddToStash(mojo::Array<StashedObjectPtr> stash) override;
-  virtual void RetrieveStash(
+  void AddToStash(mojo::Array<StashedObjectPtr> stash) override;
+  void RetrieveStash(
       const mojo::Callback<void(mojo::Array<StashedObjectPtr> stash)>& callback)
       override;
 
  private:
   base::WeakPtr<StashBackend> backend_;
 
   DISALLOW_COPY_AND_ASSIGN(StashServiceImpl);
 };
 
 StashBackend::StashBackend() : weak_factory_(this) {
@@ skipping 36 matching lines @@
 void StashServiceImpl::RetrieveStash(
     const mojo::Callback<void(mojo::Array<StashedObjectPtr>)>& callback) {
   if (!backend_) {
     callback.Run(mojo::Array<StashedObjectPtr>(0));
     return;
   }
   callback.Run(backend_->RetrieveStash());
 }
 
 }  // namespace extensions