Optimizes the operation of DeleteDatabase when no backing store exists.

content/browser/indexed_db/indexed_db_factory_impl.cc

Index: content/browser/indexed_db/indexed_db_factory_impl.cc
diff --git a/content/browser/indexed_db/indexed_db_factory_impl.cc b/content/browser/indexed_db/indexed_db_factory_impl.cc
index f818f3f6181f7adff689abe7ec8308c47d497cfd..c59e611b39deceb211c16970ab6040a540de4ee5 100644
--- a/content/browser/indexed_db/indexed_db_factory_impl.cc
+++ b/content/browser/indexed_db/indexed_db_factory_impl.cc
@@ -237,6 +237,12 @@ void IndexedDBFactoryImpl::DeleteDatabase(
   std::string data_loss_message;
   bool disk_full = false;
   leveldb::Status s;
+  IndexedDBBackingStoreMap::iterator it2 = backing_store_map_.find(origin_url);

[cmumford, 2015/04/08 15:14:35]

Just call IsBackingStoreOpen(origin_url)

+  if(it2 == backing_store_map_.end())

[cmumford, 2015/04/08 15:14:35]

spaces, and { are incorrect. Run "git cl format" to have your formatting fixed.

+  {
+      ContextDestroyed();
+      return;
+  }

[cmumford, 2015/04/08 15:14:35]

Why not have this test at the very beginning of this function?

   scoped_refptr<IndexedDBBackingStore> backing_store =
       OpenBackingStore(origin_url,
                        data_directory,