Add blob-writing functionality [as yet un-called] to IDB's backend.

content/browser/indexed_db/indexed_db_fake_backing_store.cc

Index: content/browser/indexed_db/indexed_db_fake_backing_store.cc
diff --git a/content/browser/indexed_db/indexed_db_fake_backing_store.cc b/content/browser/indexed_db/indexed_db_fake_backing_store.cc
index b483bb31d38c358ae2680088f80066ee78907f42..35e3a50e4d82e52eb534d0549810c2ad265ae498 100644
--- a/content/browser/indexed_db/indexed_db_fake_backing_store.cc
+++ b/content/browser/indexed_db/indexed_db_fake_backing_store.cc
@@ -13,6 +13,7 @@ IndexedDBFakeBackingStore::IndexedDBFakeBackingStore()
     : IndexedDBBackingStore(NULL,
                             GURL("http://localhost:81"),
                             base::FilePath(),
+                            NULL,
                             scoped_ptr<LevelDBDatabase>(),
                             scoped_ptr<LevelDBComparator>(),
                             NULL) {}
@@ -23,6 +24,7 @@ IndexedDBFakeBackingStore::IndexedDBFakeBackingStore(
     : IndexedDBBackingStore(factory,
                             GURL("http://localhost:81"),
                             base::FilePath(),
+                            NULL,
                             scoped_ptr<LevelDBDatabase>(),
                             scoped_ptr<LevelDBComparator>(),
                             task_runner) {}