Revert using app windows for Feedback app links

CL https://chromium-review.googlesource.com/c/chromium/src/+/1320216
introduced opening links in the Feedback App in App Windows, which
caused a bunch of unexpected regressions.

This CL undoes this changeas it's no longer needed.

BUG=914405
TEST=Manual

Change-Id: Iebc3c0e3cd54c18c3bc9c5056248123c894f78f5
Reviewed-on: https://chromium-review.googlesource.com/c/1376107
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616472}
2 files changed