Remove app_crash_browsertest.cc.

Remove app_crash_browsertest.cc.

This is effectively a revert of https://codereview.chromium.org/50073003
This was originally added to cover a crash in GTK, which is no longer
used. These days, other app window tests will also wait for the app
window to finish loading.

The hidden-window plus normal-window case has been added to
platform_apps/window_api.

BUG=469249
Committed: https://crrev.com/8de5ce1679b9e9bf9083fff9d938fc3d4109a62b
Cr-Commit-Position: refs/heads/master@{#321937}

[jackhou1, 2015-03-23 22:19:43]

jackhou@chromium.org changed reviewers:
+ benwells@chromium.org

[jackhou1, 2015-03-23 22:19:44]

benwells, could you take a look?

[benwells, 2015-03-24 03:26:41]

lgtm

[jackhou1, 2015-03-24 03:55:13]

The CQ bit was checked by jackhou@chromium.org

[commit-bot: I haz the power, 2015-03-24 03:55:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1024373002/20001

[commit-bot: I haz the power, 2015-03-24 05:16:30]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-24 05:17:17]

Patchset 2 (id:??) landed as
https://crrev.com/8de5ce1679b9e9bf9083fff9d938fc3d4109a62b
Cr-Commit-Position: refs/heads/master@{#321937}