Desktop PWAs: CreateWebApplicationWindow should support popup web apps

CreateWebApplicationWindow checks for disposition NEW_POPUP.

AppBrowserControllerBrowserTest.WhiteThemeForSystemAppPopup now passes
even when DesktopPWAsWithoutExtensions is enabled.

Bug: 1055645
Change-Id: Ifb15712c7bcebffba813f82ca7b7009618b31aaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071438
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744175}
3 files changed