Asynchronous initialization in Simple Index.

net/disk_cache/simple/simple_backend_impl.cc

Index: net/disk_cache/simple/simple_backend_impl.cc
diff --git a/net/disk_cache/simple/simple_backend_impl.cc b/net/disk_cache/simple/simple_backend_impl.cc
index fba0b5a9728eb6ead2535db10254605eaafc5261..cb552c212a969abda17e99e6ea53231a687e5ed0 100644
--- a/net/disk_cache/simple/simple_backend_impl.cc
+++ b/net/disk_cache/simple/simple_backend_impl.cc
@@ -69,7 +69,7 @@ int SimpleBackendImpl::CreateBackend(
 }
 
 SimpleBackendImpl::~SimpleBackendImpl() {
-  index_->Cleanup();
+  index_->WriteToDisk();
 }
 
 net::CacheType SimpleBackendImpl::GetCacheType() const {
@@ -143,7 +143,9 @@ void SimpleBackendImpl::OnExternalCacheHit(const std::string& key) {
 SimpleBackendImpl::SimpleBackendImpl(
     const scoped_refptr<base::TaskRunner>& cache_thread,
     const FilePath& path) : path_(path) {
-  index_.reset(new SimpleIndex(cache_thread, path));
+  index_.reset(new SimpleIndex(cache_thread,
+                               MessageLoopProxy::current(),  // io_thread
+                               path));
 }
 
 void SimpleBackendImpl::Initialize() {