Fix callback error for existing window creation

Currently api chrome.app.window.create in case of already existing
window simply returned that window frame regardless of its state(i.e
even when it was not yet initialized properly). This CL fixes that.

Bug: 943710
Change-Id: I41b21cde08b8b842a1cd09c5f34f953a17ab4e04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1656568
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#669449}
4 files changed