Add the IndexedDBActiveBlobRegistry, currently unused, to enable future blob

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 18ca50cbab595363fa726a044dda433b94378886..a40e5760e55dd697116bfbced42099821b7b79e2 100644
--- a/content/browser/indexed_db/indexed_db_fake_backing_store.cc
+++ b/content/browser/indexed_db/indexed_db_fake_backing_store.cc
@@ -8,6 +8,22 @@
 
 namespace content {
 
+IndexedDBFakeBackingStore::IndexedDBFakeBackingStore()
+    : IndexedDBBackingStore(NULL,
+                            GURL("http://localhost:81"),
+                            scoped_ptr<LevelDBDatabase>(),
+                            scoped_ptr<LevelDBComparator>(),
+                            NULL) {}
+
+IndexedDBFakeBackingStore::IndexedDBFakeBackingStore(
+    IndexedDBFactory* factory,
+    base::TaskRunner* task_runner)
+    : IndexedDBBackingStore(factory,
+                            GURL("http://localhost:81"),
+                            scoped_ptr<LevelDBDatabase>(),
+                            scoped_ptr<LevelDBComparator>(),
+                            task_runner) {}
+
 IndexedDBFakeBackingStore::~IndexedDBFakeBackingStore() {}
 
 std::vector<base::string16> IndexedDBFakeBackingStore::GetDatabaseNames() {
@@ -113,6 +129,9 @@ leveldb::Status IndexedDBFakeBackingStore::PutIndexDataForRecord(
   return leveldb::Status::IOError("test error");
 }
 
+void IndexedDBFakeBackingStore::ReportBlobUnused(int64 database_id,
+                                                 int64 blob_key) {}
+
 scoped_ptr<IndexedDBBackingStore::Cursor>
 IndexedDBFakeBackingStore::OpenObjectStoreKeyCursor(
     IndexedDBBackingStore::Transaction* transaction,