Update from chromium https://crrev.com/301725/

net/disk_cache/cache_util_unittest.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 "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "net/disk_cache/cache_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 namespace disk_cache {
 
 class CacheUtilTest : public PlatformTest {
  public:
-  virtual void SetUp() {
+  void SetUp() override {
     PlatformTest::SetUp();
     ASSERT_TRUE(tmp_dir_.CreateUniqueTempDir());
     cache_dir_ = tmp_dir_.path().Append(FILE_PATH_LITERAL("Cache"));
     file1_ = base::FilePath(cache_dir_.Append(FILE_PATH_LITERAL("file01")));
     file2_ = base::FilePath(cache_dir_.Append(FILE_PATH_LITERAL(".file02")));
     dir1_ = base::FilePath(cache_dir_.Append(FILE_PATH_LITERAL("dir01")));
     file3_ = base::FilePath(dir1_.Append(FILE_PATH_LITERAL("file03")));
     ASSERT_TRUE(base::CreateDirectory(cache_dir_));
     FILE *fp = base::OpenFile(file1_, "w");
     ASSERT_TRUE(fp != NULL);
@@ skipping 61 matching lines @@
 
 TEST_F(CacheUtilTest, DeleteCacheFile) {
   EXPECT_TRUE(disk_cache::DeleteCacheFile(file1_));
   EXPECT_FALSE(base::PathExists(file1_));
   EXPECT_TRUE(base::PathExists(cache_dir_)); // cache dir stays
   EXPECT_TRUE(base::PathExists(dir1_));
   EXPECT_TRUE(base::PathExists(file3_));
 }
 
 }  // namespace disk_cache