Standardize usage of virtual/override/final in cc/

cc/quads/list_container_unittest.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/quads/list_container.h"
 
 #include <vector>
 #include "cc/quads/draw_quad.h"
 #include "cc/quads/largest_draw_quad.h"
 #include "cc/quads/render_pass_draw_quad.h"
@@ skipping 11 matching lines @@
 bool isConstSharedQuadStatePointer(const SharedQuadState* ptr) {
   return true;
 }
 
 bool isConstSharedQuadStatePointer(SharedQuadState* ptr) {
   return false;
 }
 
 class SimpleDrawQuad : public DrawQuad {
  public:
-  virtual ~SimpleDrawQuad() {}
-  virtual void IterateResources(
-      const ResourceIteratorCallback& callback) override {}
+  ~SimpleDrawQuad() override {}
+  void IterateResources(const ResourceIteratorCallback& callback) override {}
 
   void set_value(int val) { value = val; }
   int get_value() { return value; }
-  virtual void ExtendValue(base::debug::TracedValue* value) const override {}
+  void ExtendValue(base::debug::TracedValue* value) const override {}
 
  private:
   int value;
 };
 
 class SimpleDrawQuadConstructMagicNumberOne : public SimpleDrawQuad {
  public:
   SimpleDrawQuadConstructMagicNumberOne() : SimpleDrawQuad() {
     set_value(kMagicNumberToUseForDrawQuadOne);
   }
@@ skipping 498 matching lines @@
   for (ListContainer<SharedQuadState>::ReverseIterator iter = list.rbegin();
        iter != list.rend();
        ++iter) {
     EXPECT_EQ(i, iter.index());
     ++i;
   }
 }
 
 }  // namespace
 }  // namespace cc