Disabling as https://chromium-review.googlesource.com/c/chromium/src/+/894736

It's been flaky for a while. Assigning to the test author to look at it.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d1d6d70eef59566f0e7b09d535a27ff8489e605d

commit d1d6d70eef59566f0e7b09d535a27ff8489e605d
Author: Bret Sepulveda <bsep@chromium.org>
Date: Wed Jan 31 01:05:15 2018

Disable HostedAppProcessModelTest.FromOutsideHostedApp/1 on Win 7.

The test is timeout-flaky.

TBR=rdevlin.cronin@chromium.org

Bug: 807471
Change-Id: Ie70d0217c21ce9ed3ae1c1a79b6a030dd70886f5
Reviewed-on: https://chromium-review.googlesource.com/894736
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533132}
[modify] https://crrev.com/d1d6d70eef59566f0e7b09d535a27ff8489e605d/chrome/browser/ui/extensions/hosted_app_browsertest.cc

Looks like the test is just too long for the slower debug bots.  Looking at https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=HostedAppProcessModelTest.FromOutsideHostedApp the successful runs on Win7 Tests (dbg)(1) were all just slightly below the 45 second cutoff.  

I'll see if I can break this test up into smaller tests, after I take care of a few higher-priority items.  We'll maintain coverage on non-Windows platforms in the meantime, and we could probably even re-enable it for Win release builds.