Show translate error message when translation failed.

Show translate error message with toast when translation failed.
And reset selection to original language.

BUG=703887
Review-Url: https://codereview.chromium.org/2842113002
Cr-Commit-Position: refs/heads/master@{#467587}
Committed: https://chromium.googlesource.com/chromium/src/+/f39b225b059efaaf2928598209a461982bd13dcb

[Leo, 2017-04-26 07:25:02]

Description was changed from

==========
Add translate error message when translation failed.
Adjust UI behavior then.

BUG=703887
==========

to

==========
Show translate error message with toast when translation failed.
And reset selection to original language.

BUG=703887
==========

[Leo, 2017-04-26 07:25:03]

googleo@chromium.org changed reviewers:
+ dfalcantara@chromium.org

[Leo, 2017-04-26 07:26:04]

Show translate error messages if there is and remove unused code.

Thanks Dan.

[gone, 2017-04-26 17:05:07]

lgtm

[Leo, 2017-04-27 03:29:55]

The CQ bit was checked by googleo@chromium.org

[commit-bot: I haz the power, 2017-04-27 03:30:24]

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, 2017-04-27 04:58:02]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493263795925370, "parent_rev":
"0050d7e332eac8bb71e895989a7515d1a49d38c6", "commit_rev":
"86dcae41aa1bf2d2068704ecd1290a3b364cfcfc"}

[commit-bot: I haz the power, 2017-04-27 04:58:20]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493263795925370, "parent_rev":
"6c647b609e420399ce92f22cadcb4de399dc001d", "commit_rev":
"f39b225b059efaaf2928598209a461982bd13dcb"}

[commit-bot: I haz the power, 2017-04-27 04:58:28]

Description was changed from

==========
Show translate error message with toast when translation failed.
And reset selection to original language.

BUG=703887
==========

to

==========
Show translate error message with toast when translation failed.
And reset selection to original language.

BUG=703887

Review-Url: https://codereview.chromium.org/2842113002
Cr-Commit-Position: refs/heads/master@{#467587}
Committed:
https://chromium.googlesource.com/chromium/src/+/f39b225b059efaaf2928598209a4...
==========

[commit-bot: I haz the power, 2017-04-27 04:58:30]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/f39b225b059efaaf2928598209a4...