Update IDBFactory open() to set its request's processed flag

Resolves a minor spec flaw noted in issue #434

Author: SteveBeckerMSFT

index.bs

@@ -2227,6 +2227,8 @@ The <dfn method for=IDBFactory>open(|name|, |version|)</dfn> method steps are:
           [=database/version=] equal to 1.
         </details>
 
+    1. Set |request|'s [=request/processed flag=] to true.
+
     1. [=Queue a task=] to run these steps:
 
         1. If |result| is an error, then:
@@ -6720,6 +6722,7 @@ For the revision history of the second edition, see [that document's Revision Hi
 * Added a definition for [=transaction/live=] transactions, and renamed "run an upgrade transaction" to [=/upgrade a database=], to disambiguate "running". (<#408>)
 * Specified the {{DOMException}} type for failures when reading a value from the underlying storage in [[#object-store-retrieval-operation]]. (<#423>)
 * Updated [=convert a value to a key=] to return invalid for detached array buffers. (<#417>)
+* Updated {{IDBFactory/open()}} to set its request's [=request/processed flag=] to true.
 
 <!-- ============================================================ -->
 # Acknowledgements # {#acknowledgements}