Initialize the simple cache backend at runtime.

net/tools/crash_cache/crash_cache.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.
 
 // This command-line program generates the set of files needed for the crash-
 // cache unit tests (DiskCacheTest,CacheBackend_Recover*). This program only
 // works properly on debug mode, because the crash functionality is not compiled
 // on release builds of the cache.
 
 #include <string>
@@ skipping 120 matching lines @@
       reinterpret_cast<disk_cache::BackendImpl*>(cache)->FlushQueueForTest(
           cb.callback());
   cb.GetResult(rv);  // Ignore the result;
 }
 
 bool CreateCache(const base::FilePath& path,
                  base::Thread* thread,
                  disk_cache::Backend** cache,
                  net::TestCompletionCallback* cb) {
   int size = 1024 * 1024;
-  int rv = disk_cache::BackendImpl::CreateBackend(
-               path, false, size, net::DISK_CACHE, disk_cache::kNoRandom,
-               thread->message_loop_proxy(), NULL, cache, cb->callback());
-
+  disk_cache::BackendImpl* backend =
+      new disk_cache::BackendImpl(path, thread->message_loop_proxy(), NULL);
+  backend->SetMaxSize(size);
+  backend->SetType(net::DISK_CACHE);
+  backend->SetFlags(disk_cache::kNoRandom);
+  int rv = backend->Init(cb->callback());
+  *cache = backend;
   return (cb->GetResult(rv) == net::OK && !(*cache)->GetEntryCount());
 }
 
 // Generates the files for an empty and one item cache.
 int SimpleInsert(const base::FilePath& path, RankCrashes action,
                  base::Thread* cache_thread) {
   net::TestCompletionCallback cb;
   disk_cache::Backend* cache;
   if (!CreateCache(path, cache_thread, &cache, &cb))
     return GENERIC;
@@ skipping 213 matching lines @@
 
   base::FilePath path;
   PathService::Get(base::DIR_SOURCE_ROOT, &path);
   path = path.AppendASCII("net");
   path = path.AppendASCII("data");
   path = path.AppendASCII("cache_tests");
   path = path.AppendASCII("new_crashes");
 
   return SlaveCode(path, action);
 }