Disable UndoTabModelTest#testUndoNotSupported

BUG=674654
TBR=dfalcantara@chromium.org

Review-Url: https://codereview.chromium.org/2575323004
Cr-Commit-Position: refs/heads/master@{#438947}

chrome/android/javatests/src/org/chromium/chrome/browser/tabmodel/UndoTabModelTest.java

@@ -1390,6 +1390,7 @@ public class UndoTabModelTest extends ChromeTabbedActivityTestBase {
      */
     @MediumTest
     @RetryOnFailure
+    @DisabledTest(message = "crbug.com/674654")
     public void testUndoNotSupported() throws InterruptedException {
         TabModel model = getActivity().getTabModelSelector().getModel(true);
         ChromeTabCreator tabCreator = getActivity().getTabCreator(true);