Run the disk cache tests in scoped temporary directories instead of a fixed directory so that they …

net/disk_cache/backend_unittest.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 "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/platform_thread.h"
@@ skipping 2338 matching lines @@
   DisableFirstCleanup();
   SetMaxSize(20 * 1024 * 1024);
   SetNewEviction();
   InitCache();
   BackendDoomAll2();
 }
 
 // We should be able to create the same entry on multiple simultaneous instances
 // of the cache.
 TEST_F(DiskCacheTest, MultipleInstances) {
-  ScopedTestCache store1(cache_path_);
-  ScopedTestCache store2("cache_test2");
-  ScopedTestCache store3("cache_test3");
+  ScopedTempDir store1, store2;
+  ASSERT_TRUE(store1.CreateUniqueTempDir());
+  ASSERT_TRUE(store2.CreateUniqueTempDir());
+
   base::Thread cache_thread("CacheThread");
   ASSERT_TRUE(cache_thread.StartWithOptions(
       base::Thread::Options(MessageLoop::TYPE_IO, 0)));
   net::TestCompletionCallback cb;
 
   const int kNumberOfCaches = 2;
   disk_cache::Backend* cache[kNumberOfCaches];
 
   int rv = disk_cache::BackendImpl::CreateBackend(
       store1.path(), false, 0, net::DISK_CACHE, disk_cache::kNone,
@@ skipping 195 matching lines @@
   // Ping the oldest entry.
   cache_->OnExternalCacheHit("key0");
 
   TrimForTest(false);
 
   // Make sure the older key remains.
   EXPECT_EQ(1, cache_->GetEntryCount());
   ASSERT_EQ(net::OK, OpenEntry("key0", &entry));
   entry->Close();
 }