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

net/disk_cache/disk_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/disk_cache_test_base.h"
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/disk_cache/backend_impl.h"
 #include "net/disk_cache/disk_cache_test_util.h"
 #include "net/disk_cache/mem_backend_impl.h"
 
 DiskCacheTest::DiskCacheTest() {
-  cache_path_ = GetCacheFilePath();
+  CHECK(temp_dir_.CreateUniqueTempDir());
+  cache_path_ = temp_dir_.path();
   if (!MessageLoop::current())
     message_loop_.reset(new MessageLoopForIO());
 }
 
 DiskCacheTest::~DiskCacheTest() {
 }
 
 bool DiskCacheTest::CopyTestCache(const std::string& name) {
   FilePath path;
   PathService::Get(base::DIR_SOURCE_ROOT, &path);
@@ skipping 262 matching lines @@
 
   if (new_eviction_)
     cache_impl_->SetNewEviction();
 
   cache_impl_->SetType(type_);
   cache_impl_->SetFlags(disk_cache::kNoRandom);
   net::TestCompletionCallback cb;
   int rv = cache_impl_->Init(cb.callback());
   ASSERT_EQ(net::OK, cb.GetResult(rv));
 }