Standardize usage of virtual/override/final specifiers in base/.

base/files/memory_mapped_file_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 "base/files/memory_mapped_file.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
@@ skipping 11 matching lines @@
 }
 
 // Check that the watermark sequence is consistent with the |offset| provided.
 bool CheckBufferContents(const uint8* data, size_t size, size_t offset) {
   scoped_ptr<uint8[]> test_data(CreateTestBuffer(size, offset));
   return memcmp(test_data.get(), data, size) == 0;
 }
 
 class MemoryMappedFileTest : public PlatformTest {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     PlatformTest::SetUp();
     CreateTemporaryFile(&temp_file_path_);
   }
 
-  virtual void TearDown() { EXPECT_TRUE(DeleteFile(temp_file_path_, false)); }
+  void TearDown() override { EXPECT_TRUE(DeleteFile(temp_file_path_, false)); }
 
   void CreateTemporaryTestFile(size_t size) {
     File file(temp_file_path_,
               File::FLAG_CREATE_ALWAYS | File::FLAG_READ | File::FLAG_WRITE);
     EXPECT_TRUE(file.IsValid());
 
     scoped_ptr<uint8[]> test_data(CreateTestBuffer(size, 0));
     size_t bytes_written =
         file.Write(0, reinterpret_cast<char*>(test_data.get()), size);
     EXPECT_EQ(size, bytes_written);
@@ skipping 109 matching lines @@
   map.Initialize(file.Pass(), MemoryMappedFile::Region(kOffset, kPartialSize));
   ASSERT_EQ(kPartialSize, map.length());
   ASSERT_TRUE(map.data() != NULL);
   EXPECT_TRUE(map.IsValid());
   ASSERT_TRUE(CheckBufferContents(map.data(), kPartialSize, kOffset));
 }
 
 }  // namespace
 
 }  // namespace base