IndexedDB: Various C++11isms and cleanup

Source/modules/indexeddb/IDBDatabase.h

Index: Source/modules/indexeddb/IDBDatabase.h
diff --git a/Source/modules/indexeddb/IDBDatabase.h b/Source/modules/indexeddb/IDBDatabase.h
index ce47117bf745602c0463984775df922efcb9fca9..297ece41c1eadb651a01a73361203f7e2cb84619 100644
--- a/Source/modules/indexeddb/IDBDatabase.h
+++ b/Source/modules/indexeddb/IDBDatabase.h
@@ -142,11 +142,10 @@ private:
     IDBDatabaseMetadata m_metadata;
     OwnPtr<WebIDBDatabase> m_backend;
     Member<IDBTransaction> m_versionChangeTransaction;
-    typedef HeapHashMap<int64_t, Member<IDBTransaction>> TransactionMap;

[cmumford, 2015/09/03 23:21:03]

Thank you - I hate typedefs.

[jsbell, 2015/09/03 23:29:54]

Check out the one for a function reference (?) in IndexedDBClient.h. I'd like to
make that a 'using' alias instead but I don't even understand how it's working.

(Some quick reading says that function references, direct uses, or
pointers-to-pointers all get treated as just function pointers, but it still
hurts my brain.)

-    TransactionMap m_transactions;
+    HeapHashMap<int64_t, Member<IDBTransaction>> m_transactions;
 
-    bool m_closePending;
-    bool m_contextStopped;
+    bool m_closePending = false;
+    bool m_contextStopped = false;
 
     // Keep track of the versionchange events waiting to be fired on this
     // database so that we can cancel them if the database closes.