Handle no cellular device more gracefully in choose-mobile-network UI.

Handle no cellular device more gracefully in choose-mobile-network UI.

chrome://choose-mobile-network can be launched on a Chromebook without
any cellular modem. This CL changes the UI to handle such case more
gracefully:

- Without overhauling the UI too much, the UI is changed to simply show
  'No networks found'.
- When the Cancel button is pressed, the UI performs nothing.

BUG=714547
TEST=Tested the following:
- Launch chrome://choose-mobile-network on a Chromebook without a
  cellular modem. Verify that the UI shows 'No networks found'.
  Click the Cancel button and verify that the UI doesn't crash.
- Launch chrome://choose-mobile-network on a Chromebook with a cellular
  modem. Verify that the UI can populate a list of networks after
  successfully scanning for networks, and the Connect and Cancel button
  function correctly.

Review-Url: https://codereview.chromium.org/2851863003
Cr-Commit-Position: refs/heads/master@{#468176}
Committed: https://chromium.googlesource.com/chromium/src/+/5276c8837ad126b4ef5de6dd3216c18e81d5e6b6

[Ben Chan, 2017-04-28 22:22:59]

The CQ bit was checked by benchan@chromium.org to run a CQ dry run

[Ben Chan, 2017-04-28 22:23:39]

Description was changed from

==========
Handle no cellular device more gracefully in choose-mobile-network UI.

chrome://choose-mobile-network can be launched on a Chromebook without
any cellular modem. This CL changes the UI to handle such case more
gracefully:

- Without overhauling the UI too much, the UI is changed to simply show
  'No networks found'.
- When the Cancel button is pressed, the UI performs nothing.

BUG=714547
TEST=Tested the following:
- Launch chrome://choose-mobile-network on a Chromebook without a
  cellular modem. Verify that the UI shows 'No networks found'.
  Click the Cancel button and verify that the UI doesn't crash.
- Launch chrome://choose-mobile-network on a Chromebook with a cellular
  modem. Verify that the UI can populate a list of networks after
  successfully scanning for networks, and the Connect and Cancel button
  function correctly.
==========

to

==========
Handle no cellular device more gracefully in choose-mobile-network UI.

chrome://choose-mobile-network can be launched on a Chromebook without
any cellular modem. This CL changes the UI to handle such case more
gracefully:

- Without overhauling the UI too much, the UI is changed to simply show
  'No networks found'.
- When the Cancel button is pressed, the UI performs nothing.

BUG=714547
TEST=Tested the following:
- Launch chrome://choose-mobile-network on a Chromebook without a
  cellular modem. Verify that the UI shows 'No networks found'.
  Click the Cancel button and verify that the UI doesn't crash.
- Launch chrome://choose-mobile-network on a Chromebook with a cellular
  modem. Verify that the UI can populate a list of networks after
  successfully scanning for networks, and the Connect and Cancel button
  function correctly.
==========

[Ben Chan, 2017-04-28 22:23:39]

benchan@chromium.org changed reviewers:
+ stevenjb@chromium.org

[commit-bot: I haz the power, 2017-04-28 22:23:44]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-28 23:00:08]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-28 23:00:09]

Dry run: This issue passed the CQ dry run.

[stevenjb, 2017-04-28 23:04:22]

Thanks! LGTM.

[Ben Chan, 2017-04-28 23:15:36]

The CQ bit was checked by benchan@chromium.org

[commit-bot: I haz the power, 2017-04-28 23:16:02]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-28 23:21:48]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493421336827890, "parent_rev":
"2a938c3d286c77d7b769a9b7dc31bab8a309d19b", "commit_rev":
"5276c8837ad126b4ef5de6dd3216c18e81d5e6b6"}

[commit-bot: I haz the power, 2017-04-28 23:22:07]

Description was changed from

==========
Handle no cellular device more gracefully in choose-mobile-network UI.

chrome://choose-mobile-network can be launched on a Chromebook without
any cellular modem. This CL changes the UI to handle such case more
gracefully:

- Without overhauling the UI too much, the UI is changed to simply show
  'No networks found'.
- When the Cancel button is pressed, the UI performs nothing.

BUG=714547
TEST=Tested the following:
- Launch chrome://choose-mobile-network on a Chromebook without a
  cellular modem. Verify that the UI shows 'No networks found'.
  Click the Cancel button and verify that the UI doesn't crash.
- Launch chrome://choose-mobile-network on a Chromebook with a cellular
  modem. Verify that the UI can populate a list of networks after
  successfully scanning for networks, and the Connect and Cancel button
  function correctly.
==========

to

==========
Handle no cellular device more gracefully in choose-mobile-network UI.

chrome://choose-mobile-network can be launched on a Chromebook without
any cellular modem. This CL changes the UI to handle such case more
gracefully:

- Without overhauling the UI too much, the UI is changed to simply show
  'No networks found'.
- When the Cancel button is pressed, the UI performs nothing.

BUG=714547
TEST=Tested the following:
- Launch chrome://choose-mobile-network on a Chromebook without a
  cellular modem. Verify that the UI shows 'No networks found'.
  Click the Cancel button and verify that the UI doesn't crash.
- Launch chrome://choose-mobile-network on a Chromebook with a cellular
  modem. Verify that the UI can populate a list of networks after
  successfully scanning for networks, and the Connect and Cancel button
  function correctly.

Review-Url: https://codereview.chromium.org/2851863003
Cr-Commit-Position: refs/heads/master@{#468176}
Committed:
https://chromium.googlesource.com/chromium/src/+/5276c8837ad126b4ef5de6dd3216...
==========

[commit-bot: I haz the power, 2017-04-28 23:22:08]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/5276c8837ad126b4ef5de6dd3216...