Remove the flash specific disk cache backend.

net/disk_cache/flash/flash_cache_test_base.cc

-// Copyright (c) 2012 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 "net/disk_cache/flash/flash_cache_test_base.h"
-
-#include "base/files/file_path.h"
-#include "base/files/scoped_temp_dir.h"
-#include "base/time/time.h"
-#include "net/disk_cache/flash/format.h"
-#include "net/disk_cache/flash/log_store.h"
-#include "net/disk_cache/flash/storage.h"
-
-FlashCacheTest::FlashCacheTest() {
-  int seed = static_cast<int>(base::Time::Now().ToInternalValue());
-  srand(seed);
-}
-
-FlashCacheTest::~FlashCacheTest() {
-}
-
-void FlashCacheTest::SetUp() {
-  const base::FilePath::StringType kCachePath = FILE_PATH_LITERAL("cache");
-  ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
-  path_ = temp_dir_.path().Append(kCachePath);
-}
-
-void FlashCacheTest::TearDown() {
-}