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This CL fixes and issue where it was assumed that all Chrome App Windows
have the chrome.app.window API. Some broken corner cases don't have this
API and it caused chrome.app.window.getAll() calls to fail.

This CL filters out broken windows before returning to the caller.

Bug: 1021014
Change-Id: Ia3f09b1393c62bd3e2dfc88de36c8f4cc9417910
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029397Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738074}