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..bf1eda0e55a91b8424d5c778d8d3de223d6d2080 100644
--- a/net/tools/crash_cache/crash_cache.cc
+++ b/net/tools/crash_cache/crash_cache.cc
@@ -138,8 +138,8 @@ 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,
+  int rv = disk_cache::CreateCacheBackendWithFlags(
+               net::DISK_CACHE, path, size, false, disk_cache::kNoRandom,
                thread->message_loop_proxy(), NULL, cache, cb->callback());
 
   return (cb->GetResult(rv) == net::OK && !(*cache)->GetEntryCount());