[App Management] Change HTML import from absolute to relative.

This CL changes all chrome://apps HTML import to its relative path.

Bug: 906508
Change-Id: Iab67b3e5120c4907b6e3d9b5422a1c19f266aaaf
Reviewed-on: https://chromium-review.googlesource.com/c/1440804
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626848}
3 files changed