Fire window.onerror for uncaught IndexedDB errors

LayoutTests/storage/indexeddb/resources/intversion-upgrades.js

Index: LayoutTests/storage/indexeddb/resources/intversion-upgrades.js
diff --git a/LayoutTests/storage/indexeddb/resources/intversion-upgrades.js b/LayoutTests/storage/indexeddb/resources/intversion-upgrades.js
index 374707dd1a69c11d634f8cf923e8981200040b31..6fa9f34e71da26fa48926de1e4d6f22d131274d1 100644
--- a/LayoutTests/storage/indexeddb/resources/intversion-upgrades.js
+++ b/LayoutTests/storage/indexeddb/resources/intversion-upgrades.js
@@ -40,7 +40,7 @@ function openSuccess(evt)
     shouldBe("connection1.version", "1");
     evalAndLog("connection1.onversionchange = connection1VersionChangeCallback");
     evalAndLog("request = indexedDB.open(dbname, 2)");
-    request.onupgradeneeded = connection2UpgradeNeeded
+    request.onupgradeneeded = connection2UpgradeNeeded;
     request.onerror = unexpectedErrorCallback;
     request.onblocked = connection2BlockedCallback;
     request.onsuccess = connection2Success;
@@ -111,6 +111,8 @@ function errorWhenTryingLowVersion(evt)
 {
     preamble(evt);
     debug("request.error.message = " + request.error.message);
+    evt.preventDefault();
+
     evalAndLog("request = indexedDB.open(dbname, 4)");
     request.onblocked = unexpectedBlockedCallback;
     request.onerror = unexpectedErrorCallback;