Fire window.onerror for uncaught IndexedDB errors

LayoutTests/storage/indexeddb/resources/version-change-abort.js

 if (this.importScripts) {
     importScripts('../../../resources/js-test.js');
     importScripts('shared.js');
 }
 
 description("Ensure that aborted VERSION_CHANGE transactions are completely rolled back");
 
+self.isOnErrorTest = true;
+
 indexedDBTest(prepareDatabase, setVersion1Complete);
 function prepareDatabase()
 {
     db = event.target.result;
     trans = event.target.transaction;
     shouldBeTrue("trans instanceof IDBTransaction");
     trans.onabort = unexpectedAbortCallback;
     trans.onerror = unexpectedErrorCallback;
 
     evalAndLog("store = db.createObjectStore('store1')");
 }
 
 function setVersion1Complete()
 {
     debug("setVersion1 complete");
     shouldBe("db.version", "1");
     debug("");
     db.close();
 
     evalAndLog("vcreq = indexedDB.open(dbname, 2)");
     vcreq.onupgradeneeded = inSetVersion2;
     vcreq.onerror = setVersion2Abort;
     vcreq.onblocked = unexpectedBlockedCallback;
     vcreq.onsuccess = unexpectedSuccessCallback;
+    expectError();
 }
 
 function inSetVersion2()
 {
     db = event.target.result;
     debug("setVersion2() callback");
     shouldBe("db.version", "2");
     shouldBeTrue("vcreq.transaction instanceof IDBTransaction");
     trans = vcreq.result;
     trans.onerror = unexpectedErrorCallback;
     trans.oncomplete = unexpectedCompleteCallback;
 
     evalAndLog("store = db.deleteObjectStore('store1')");
     evalAndLog("store = db.createObjectStore('store2')");
 
-    // Ensure the test harness error handler is not invoked.
-    self.originalWindowOnError = self.onerror;
-    self.onerror = null;
-
     debug("raising exception");
     throw new Error("This should *NOT* be caught!");
 }
 
-function setVersion2Abort()
+function setVersion2Abort(evt)
 {
     debug("");
     debug("setVersion2Abort() callback");
+    evt.preventDefault();
+    db.close();
 
-    // Restore test harness error handler.
-    self.onerror = self.originalWindowOnError;
-    db.close();
     evalAndLog("request = indexedDB.open(dbname)");
     request.onblocked = unexpectedBlockedCallback;
     request.onupgradeneeded = unexpectedUpgradeNeededCallback;
     request.onerror = unexpectedErrorCallback;
     request.onsuccess = function (e) {
         db = event.target.result;
         shouldBe("db.version", "1");
         shouldBeTrue("db.objectStoreNames.contains('store1')");
         shouldBeFalse("db.objectStoreNames.contains('store2')");
 
         finishJSTest();
-    }
+    };
 }