IndexedDBQuotaClient doesn't need to inherit from storage::QuotaTaskObserver

content/browser/indexed_db/indexed_db_quota_client.h

Index: content/browser/indexed_db/indexed_db_quota_client.h
diff --git a/content/browser/indexed_db/indexed_db_quota_client.h b/content/browser/indexed_db/indexed_db_quota_client.h
index 7894a653f26482bd97ad4d04191a86940a81eb06..b9e9bceed0add6ca05dbc0a95008ec2dc988e119 100644
--- a/content/browser/indexed_db/indexed_db_quota_client.h
+++ b/content/browser/indexed_db/indexed_db_quota_client.h
@@ -22,8 +22,7 @@ class IndexedDBContextImpl;
 // A QuotaClient implementation to integrate IndexedDB
 // with the quota  management system. This interface is used
 // on the IO thread by the quota manager.
-class IndexedDBQuotaClient : public storage::QuotaClient,
-                             public storage::QuotaTaskObserver {
+class IndexedDBQuotaClient : public storage::QuotaClient {
  public:
   CONTENT_EXPORT explicit IndexedDBQuotaClient(
       IndexedDBContextImpl* indexed_db_context);