Standardize usage of virtual/override/final in cc/

cc/blink/web_layer_impl.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 "cc/blink/web_layer_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event_impl.h"
 #include "base/lazy_instance.h"
 #include "base/strings/string_util.h"
@@ skipping 417 matching lines @@
 
 void WebLayerImpl::setWebLayerClient(blink::WebLayerClient* client) {
   web_layer_client_ = client;
 }
 
 class TracedDebugInfo : public base::debug::ConvertableToTraceFormat {
  public:
   // This object takes ownership of the debug_info object.
   explicit TracedDebugInfo(blink::WebGraphicsLayerDebugInfo* debug_info)
       : debug_info_(debug_info) {}
-  virtual void AppendAsTraceFormat(std::string* out) const override {
+  void AppendAsTraceFormat(std::string* out) const override {
     DCHECK(thread_checker_.CalledOnValidThread());
     blink::WebString web_string;
     debug_info_->appendAsTraceFormat(&web_string);
     out->append(web_string.utf8());
   }
 
  private:
-  virtual ~TracedDebugInfo() {}
+  ~TracedDebugInfo() override {}
   scoped_ptr<blink::WebGraphicsLayerDebugInfo> debug_info_;
   base::ThreadChecker thread_checker_;
 };
 
 scoped_refptr<base::debug::ConvertableToTraceFormat>
 WebLayerImpl::TakeDebugInfo() {
   if (!web_layer_client_)
     return nullptr;
   blink::WebGraphicsLayerDebugInfo* debug_info =
       web_layer_client_->takeDebugInfoFor(this);
@@ skipping 16 matching lines @@
   if (parent)
     clip_parent = static_cast<WebLayerImpl*>(parent)->layer();
   layer_->SetClipParent(clip_parent);
 }
 
 Layer* WebLayerImpl::layer() const {
   return layer_.get();
 }
 
 }  // namespace cc_blink