Index: dom_storage_area.cc
===================================================================
--- dom_storage_area.cc	(revision 157234)
+++ dom_storage_area.cc	(working copy)
@@ -289,8 +289,11 @@
 void DomStorageArea::CommitChanges(const CommitBatch* commit_batch) {
   // This method executes on the commit sequence.
   DCHECK(task_runner_->IsRunningOnCommitSequence());
-  bool success = backing_->CommitChanges(commit_batch->clear_all_first,
-                                         commit_batch->changed_values);
+  bool success = false;
+  if (backing_.get() && commit_batch) {
+    success = backing_->CommitChanges(commit_batch->clear_all_first,
+                                      commit_batch->changed_values);
+  }
   DCHECK(success);  // TODO(michaeln): what if it fails?
   task_runner_->PostTask(
       FROM_HERE,