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This change deletes the manifest.json, and pwa.html files, replacing them
with an identical installation using a WebApplicationInfo struct created
in C++. The reason for this is to avoid SWA installation flakiness and
slowness.

Bug: 1085274
Change-Id: I85fcf8589dc269ab2ed60b517ed65f69cc79735d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367397Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Jiewei Qian  <qjw@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Dominic Schulz <dominicschulz@google.com>
Cr-Commit-Position: refs/heads/master@{#805521}