Standardize usage of virtual/override/final specifiers.

gpu/tools/compositor_model_bench/forward_render_model.cc

 // Copyright (c) 2011 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 "gpu/tools/compositor_model_bench/forward_render_model.h"
 
 #include <cstdlib>
 #include <vector>
 
 #include "gpu/tools/compositor_model_bench/render_model_utils.h"
 
 using std::vector;
 
 class ForwardRenderNodeVisitor : public RenderNodeVisitor {
  public:
   ForwardRenderNodeVisitor() {}
 
-  virtual void BeginVisitRenderNode(RenderNode* v) override {
-    NOTREACHED();
-  }
+  void BeginVisitRenderNode(RenderNode* v) override { NOTREACHED(); }
 
-  virtual void BeginVisitCCNode(CCNode* v) override {
+  void BeginVisitCCNode(CCNode* v) override {
     if (!v->drawsContent())
       return;
     ConfigAndActivateShaderForNode(v);
     DrawQuad(v->width(), v->height());
   }
 
-  virtual void BeginVisitContentLayerNode(ContentLayerNode* l) override {
+  void BeginVisitContentLayerNode(ContentLayerNode* l) override {
     if (!l->drawsContent())
       return;
     ConfigAndActivateShaderForTiling(l);
     // Now that we capture root layer tiles, a layer without tiles
     // should not get drawn.
     for (size_t n = 0; n < l->num_tiles(); ++n) {
       const Tile* i = l->tile(n);
       DrawTileQuad(i->texID, i->x, i->y);
     }
   }
@@ skipping 21 matching lines @@
   glClear(GL_COLOR_BUFFER_BIT);
   glColorMask(true, true, true, false);
   BeginFrame();
   root_->Accept(visitor_.get());
 }
 
 void ForwardRenderSimulator::Resize(int width, int height) {
   glViewport(0, 0, width, height);
 }