Standardize usage of virtual/override/final specifiers.

gpu/command_buffer/common/id_allocator_test.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.
 
 // This file has the unit tests for the IdAllocator class.
 
 #include "gpu/command_buffer/common/id_allocator.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gpu {
 
 class IdAllocatorTest : public testing::Test {
  protected:
-  virtual void SetUp() {}
-  virtual void TearDown() {}
+  void SetUp() override {}
+  void TearDown() override {}
 
   IdAllocator* id_allocator() { return &id_allocator_; }
 
  private:
   IdAllocator id_allocator_;
 };
 
 // Checks basic functionality: AllocateID, FreeID, InUse.
 TEST_F(IdAllocatorTest, TestBasic) {
   IdAllocator *allocator = id_allocator();
@@ skipping 93 matching lines @@
   allocator->FreeID(id1 + 1);
 
   ResourceId id2 = allocator->AllocateID();
   ResourceId id3 = allocator->AllocateID();
   EXPECT_NE(id2, id3);
   EXPECT_NE(kInvalidResource, id2);
   EXPECT_NE(kInvalidResource, id3);
 }
 
 }  // namespace gpu