Make SimpleEntryImpl ref counted.

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 8b8bef4ca48e8a918fea0d6d0e2eda28b3eee16a..06176379a5b3d4bc0eebff201c12203d239d3611 100644
--- a/net/disk_cache/simple/simple_backend_impl.cc
+++ b/net/disk_cache/simple/simple_backend_impl.cc
@@ -78,20 +78,18 @@ int32 SimpleBackendImpl::GetEntryCount() const {
 int SimpleBackendImpl::OpenEntry(const std::string& key,
                                  Entry** entry,
                                  const CompletionCallback& callback) {
-  return SimpleEntryImpl::OpenEntry(
-      index_->AsWeakPtr(), path_, key, entry, callback);
+  return SimpleEntryImpl::OpenEntry(index_, path_, key, entry, callback);
 }
 
 int SimpleBackendImpl::CreateEntry(const std::string& key,
                                    Entry** entry,
                                    const CompletionCallback& callback) {
-  return SimpleEntryImpl::CreateEntry(
-      index_->AsWeakPtr(), path_, key, entry, callback);
+  return SimpleEntryImpl::CreateEntry(index_, path_, key, entry, callback);
 }
 
 int SimpleBackendImpl::DoomEntry(const std::string& key,
                                  const net::CompletionCallback& callback) {
-  return SimpleEntryImpl::DoomEntry(index_->AsWeakPtr(), path_, key, callback);
+  return SimpleEntryImpl::DoomEntry(index_, path_, key, callback);
 }
 
 int SimpleBackendImpl::DoomAllEntries(const CompletionCallback& callback) {