Test changes accompanying Dartium indexed DB fixes

tests/html/html.status

 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 async_window_test: Skip #TODO(gram): investigating
 event_test: Skip  # Issue 1996
 interactive_test: Skip # Must be run manually.
 
 [ $compiler == dart2js && $runtime != drt ]
 custom/*: Skip
 
 [ $compiler == dart2js && $browser ]
 # Issue 9325 failures
 custom/attribute_changed_callback_test: Fail
 
 [ $compiler == none && ($runtime == drt || $runtime == dartium) && $mode == debug && $system == macos]
 audiobuffersourcenode_test: Pass, Fail, Crash # http://crbug.com/256601
 
 [ $compiler == none && $runtime == dartium && $system == macos]
 canvasrenderingcontext2d_test/drawImage_video_element_dataUrl: Pass,Fail # Issue 11834
 
 [ $compiler == none && ($runtime == drt || $runtime == dartium) ]
 # postMessage in dartium always transfers the typed array buffer, never a view
 postmessage_structured_test/typed_arrays: Fail
 xhr_test: Pass, Fail # Issue 12648
 custom/attribute_changed_callback_test: Fail # 12643
 custom/created_callback_test: Fail # Issue 12642
-indexeddb_3_test: Skip # Issue 12948
-indexeddb_4_test: Skip # Issue 12948
-indexeddb_5_test: Skip # Issue 12948
 
 [ $compiler == none && $runtime == drt && $system == windows ]
 worker_test/functional: Pass, Crash # Issue 9929.
 
 [ $compiler == dart2js && ($runtime == ie9 || $runtime == ie10 || $runtime == safari || $runtime == ff || $runtime == chrome || $runtime == chromeOnAndroid || $runtime == opera || $runtime == drt || $runtime == dartium)]
 dom_isolates_test: Skip # Need to migrate to new spawnDomFunction.
 
 [ $compiler == dart2js && $runtime == ie10 ]
 async_test: Pass, Fail # timers test fails on ie10.
 indexeddb_2_test: Fail # Issue 12893
@@ skipping 332 matching lines @@
 event_customevent_test: Fail       # Test cannot run under CSP restrictions.
 js_interop_1_test: Skip            # Test cannot run under CSP restrictions (times out).
 js_interop_2_test: Fail, OK        # Test cannot run under CSP restrictions.
 js_interop_3_test: Skip            # Test cannot run under CSP restrictions (times out).
 js_test: Skip                      # Test cannot run under CSP restrictions (times out).
 postmessage_structured_test: Skip  # Test cannot run under CSP restrictions (times out).
 safe_dom_test: Skip                # Test cannot run under CSP restrictions (times out).
 
 [ $compiler == dart2js && $runtime == drt ]
 wheelevent_test: Fail # http://dartbug.com/12958