Mark IndexedDBBrowserTest.ClearLocalState and IndexedDBBrowserTest.SaveSessionState as flaky.

BUG=115188
TEST=

TBR=dgrogan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9416079

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@122925 0039d316-1c4b-4281-b951-d872f2087c98
  IndexedDBBrowserTest() {
    EnableDOMAutomation();
  }

  IndexedDBBrowserTest() {
    EnableDOMAutomation();
  }
