Revert "Persist PWA plus install icon across page loads within the app scope"

This reverts commit 48a40d8b1b60676e8c1d073f89bdee590f3e9aa2.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 642935 as the
culprit for failures in the build cycles as shown on:
https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzQ4YTQwZDhiMWI2MDY3NmU4YzFkMDczZjg5YmRlZTU5MGYzZTlhYTIM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.linux/Linux%20Tests%20%28dbg%29%281%29/79120

Sample Failed Step: browser_tests

Original change's description:
> Persist PWA plus install icon across page loads within the app scope
> 
> This CL ensures we remember if a site is within a previously seen
> installable scope and avoid flashing the PWA install icon redundantly.
> 
> Navigations between different installable scopes will still refresh
> the PWA install icon and animation.
> 
> Before: https://bugs.chromium.org/p/chromium/issues/attachment?aid=383598&signed_aid=00fO__OjzcMdMxXswKP9nQ==&inline=1
> After: https://bugs.chromium.org/p/chromium/issues/attachment?aid=383599&signed_aid=8T4ag_9niDNF28Q3N_ggYA==&inline=1
> 
> Bug: 907351
> Change-Id: Ib21542d44fafb7d6777b6782ba1654266d2e582f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1514282
> Commit-Queue: Dominick Ng <dominickn@chromium.org>
> Reviewed-by: Dominick Ng <dominickn@chromium.org>
> Auto-Submit: Alan Cutter <alancutter@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#642935}

Change-Id: Ic3b1a42ae9d7fb0fe7b0abeb15d250f530db94b8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 907351
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1534114
Cr-Commit-Position: refs/heads/master@{#643012}
11 files changed