Fire window.onerror for uncaught IndexedDB errors

LayoutTests/storage/indexeddb/resources/metadata.js

Index: LayoutTests/storage/indexeddb/resources/metadata.js
diff --git a/LayoutTests/storage/indexeddb/resources/metadata.js b/LayoutTests/storage/indexeddb/resources/metadata.js
index af93e0ea2b9558cbf4010c121e247c2d61ef057d..a52641d48e6a5b93cf6d351fdb4814f820170091 100644
--- a/LayoutTests/storage/indexeddb/resources/metadata.js
+++ b/LayoutTests/storage/indexeddb/resources/metadata.js
@@ -70,11 +70,13 @@ function thirdOpen()
         debug("Connection's properties should be reverted on abort");
         evalAndLog("trans.abort()");
     };
-    request.onerror = function() {
+    request.onerror = function(evt) {
+        evt.preventDefault();
+
         debug("Connection's properties should be snapshotted on close");
         evalAndLog("connection3.close()");
         fourthOpen();
-    }
+    };
 }
 
 function fourthOpen()