Remove the unsed code for showing Toast after shortcut added by O API.

Remove the unsed code for showing Toast after shortcut added by O API.
In https://chrome-internal-review.googlesource.com/c/356025, we disabled
the toast after shortcut added to homescreen using Android O's API.
This CL is to remove the unsed code in Chrome's public repository.

BUG=714420
Review-Url: https://codereview.chromium.org/2829233002
Cr-Commit-Position: refs/heads/master@{#466577}
Committed: https://chromium.googlesource.com/chromium/src/+/cf6ef1f8eddd620ccbfc3339aaa34f944462af52

[Marti Wong, 2017-04-21 05:23:19]

martiw@chromium.org changed reviewers:
+ dfalcantara@chromium.org, dominickn@chromium.org

[Marti Wong, 2017-04-21 05:23:19]

PTAL.  thanks~!

[dominickn, 2017-04-21 05:37:11]

lgtm, thanks!

[gone, 2017-04-21 21:44:28]

lgtm

[Marti Wong, 2017-04-23 03:37:56]

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

[commit-bot: I haz the power, 2017-04-23 03:38:02]

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, 2017-04-23 04:13:18]

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

[commit-bot: I haz the power, 2017-04-23 04:13:19]

Dry run: This issue passed the CQ dry run.

[Marti Wong, 2017-04-24 02:00:11]

The CQ bit was checked by martiw@chromium.org

[commit-bot: I haz the power, 2017-04-24 02:00:20]

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, 2017-04-24 02:03:28]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1492999211009650, "parent_rev":
"081c5abe1f023603f1af0db522848988255b4a7c", "commit_rev":
"cf6ef1f8eddd620ccbfc3339aaa34f944462af52"}

[commit-bot: I haz the power, 2017-04-24 02:04:22]

Description was changed from

==========
Remove the unsed code for showing Toast after shortcut added by O API.
In https://chrome-internal-review.googlesource.com/c/356025, we disabled
the toast after shortcut added to homescreen using Android O's API.
This CL is to remove the unsed code in Chrome's public repository.

BUG=714420
==========

to

==========
Remove the unsed code for showing Toast after shortcut added by O API.
In https://chrome-internal-review.googlesource.com/c/356025, we disabled
the toast after shortcut added to homescreen using Android O's API.
This CL is to remove the unsed code in Chrome's public repository.

BUG=714420

Review-Url: https://codereview.chromium.org/2829233002
Cr-Commit-Position: refs/heads/master@{#466577}
Committed:
https://chromium.googlesource.com/chromium/src/+/cf6ef1f8eddd620ccbfc3339aaa3...
==========

[commit-bot: I haz the power, 2017-04-24 02:04:23]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/cf6ef1f8eddd620ccbfc3339aaa3...