drive: Stop using callback for ResourceMetadataStorage::Iterate

chrome/browser/chromeos/drive/resource_metadata.cc

Index: chrome/browser/chromeos/drive/resource_metadata.cc
diff --git a/chrome/browser/chromeos/drive/resource_metadata.cc b/chrome/browser/chromeos/drive/resource_metadata.cc
index 7da356d2d87a62b56bc5d3887b788b3f056d079a..d1e9463fd66e927652a2e2042e8ac59dc0e18171 100644
--- a/chrome/browser/chromeos/drive/resource_metadata.cc
+++ b/chrome/browser/chromeos/drive/resource_metadata.cc
@@ -827,7 +827,10 @@ void ResourceMetadata::IterateEntries(const IterateCallback& callback) {
   DCHECK(blocking_task_runner_->RunsTasksOnCurrentThread());
   DCHECK(!callback.is_null());
 
-  storage_->Iterate(callback);
+  scoped_ptr<ResourceMetadataStorage::Iterator> it = storage_->GetIterator();
+  for (; !it->IsAtEnd(); it->Advance())
+    callback.Run(it->Get());
+  DCHECK(!it->HasError());  // TODO(hashimoto): Report error correctly.
 }
 
 void ResourceMetadata::GetEntryInfoPairByPathsOnUIThreadAfterGetFirst(