Disable WebViewInteractiveTest.NewWindow_OpenInNewTab on OS_MACOSX, until the problem to miss keyup event with command key is fixed

      BUG=425859
R=avi@chromium.org
R=lazyboy@chromium.org

Review URL: https://codereview.chromium.org/692113002

Cr-Commit-Position: refs/heads/master@{#302397}