Fixit: Cleanup of InfoBarController.

Fixit: Cleanup of InfoBarController.

Removed instance variables from the header file, and cleaned up
subclasses initializing ivars directly.

Changed the way the InfobarView is created to avoid passing around an
allocated but uninitialized object.

BUG=None

Committed: https://crrev.com/00a31e2fd4e7f4ae5880a7396d95ca6071f974c7
Cr-Commit-Position: refs/heads/master@{#332181}

[noyau (Ping after 24h), 2015-06-01 11:52:13]

noyau@chromium.org changed reviewers:
+ droger@chromium.org

[noyau (Ping after 24h), 2015-06-01 11:52:14]

As discussed offline, the provider now returns a retained object.

[droger, 2015-06-01 11:55:32]

lgtm

[noyau (Ping after 24h), 2015-06-01 12:00:21]

The CQ bit was checked by noyau@chromium.org

[commit-bot: I haz the power, 2015-06-01 12:00:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1161243002/20001

[commit-bot: I haz the power, 2015-06-01 12:07:52]

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

[commit-bot: I haz the power, 2015-06-01 12:07:53]

Try jobs failed on following builders:
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)

[noyau (Ping after 24h), 2015-06-01 12:15:23]

The CQ bit was checked by noyau@chromium.org

[noyau (Ping after 24h), 2015-06-01 12:15:23]

The patchset sent to the CQ was uploaded after l-g-t-m from droger@chromium.org
Link to the patchset: https://codereview.chromium.org/1161243002/#ps40001
(title: "Adding mising forward declaration.")

[commit-bot: I haz the power, 2015-06-01 12:15:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1161243002/40001

[commit-bot: I haz the power, 2015-06-01 12:23:06]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-06-01 12:24:04]

Patchset 3 (id:??) landed as
https://crrev.com/00a31e2fd4e7f4ae5880a7396d95ca6071f974c7
Cr-Commit-Position: refs/heads/master@{#332181}