Remove the notifyFailedSignedIn callback from Chromium.

Remove the notifyFailedSignedIn callback from Chromium.

As this is not a part of the specification https://w3c.github.io/webappsec/specs/credentialmanagement/#credentialcontainer

Also remove the associated acknowledgeFailedSignIn messages.

This patch is a part of a two-sided patchset:
Blink: https://codereview.chromium.org/1217463002/
Chromium: https://codereview.chromium.org/1215653003/ <-- this patch

BUG=494880
Committed: https://crrev.com/94c6e97308ce39079a3f5213db4acefbf6eaac9b
Cr-Commit-Position: refs/heads/master@{#337208}

[msramek, 2015-06-29 09:20:12]

msramek@chromium.org changed reviewers:
+ mkwst@chromium.org

[msramek, 2015-06-29 09:20:13]

...and the second part. If I understand correctly, there should be no third
part, since the callback back to Blink is just some generic code shared with
AcknowledgeSignedIn() etc.

[Mike West, 2015-06-29 09:29:37]

Implementation and dropping the IPC LGTM. Thanks!

[msramek, 2015-06-30 09:22:48]

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

[commit-bot: I haz the power, 2015-06-30 09:23:00]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215653003/1

[commit-bot: I haz the power, 2015-06-30 09:33:23]

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

[commit-bot: I haz the power, 2015-06-30 09:33:24]

Dry run: Exceeded global retry quota

[msramek, 2015-06-30 11:57:33]

Forgot about one occurrence.

[msramek, 2015-06-30 12:07:32]

Patchset #2 (id:20001) has been deleted

[msramek, 2015-07-02 11:20:43]

The CQ bit was checked by msramek@chromium.org

[msramek, 2015-07-02 11:20:44]

The patchset sent to the CQ was uploaded after l-g-t-m from mkwst@chromium.org
Link to the patchset: https://codereview.chromium.org/1215653003/#ps60001
(title: "components_browsertests")

[commit-bot: I haz the power, 2015-07-02 11:21:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215653003/60001

[commit-bot: I haz the power, 2015-07-02 12:41:56]

Committed patchset #3 (id:60001)

[commit-bot: I haz the power, 2015-07-02 12:43:01]

Patchset 3 (id:??) landed as
https://crrev.com/94c6e97308ce39079a3f5213db4acefbf6eaac9b
Cr-Commit-Position: refs/heads/master@{#337208}