Initialize the simple cache backend at runtime.

net/tools/crash_cache/crash_cache.cc

Index: net/tools/crash_cache/crash_cache.cc
diff --git a/net/tools/crash_cache/crash_cache.cc b/net/tools/crash_cache/crash_cache.cc
index 39f9d103912bfff7684694f591a211c0ad38e893..be9057d1bf492d6969a422753bc5eba212d6a1b1 100644
--- a/net/tools/crash_cache/crash_cache.cc
+++ b/net/tools/crash_cache/crash_cache.cc
@@ -138,10 +138,13 @@ bool CreateCache(const base::FilePath& path,
                  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());
 }