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Change the host URL of App Management from chrome://apps to
chrome://app-management.

Bug: 949397
Change-Id: I84679310872fd1d74ceef20b58f335e99f81aaca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1556863Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Jeevan Shikaram <jshikaram@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649794}