[Notifications] Make image background white like notification background

[Notifications] Make image background white like notification background

Suggested by UI reviewers, and looks a little cleaner.

BUG=668087
Committed: https://crrev.com/1da7201bea9f6d2cd10619638fca3f0526778d73
Cr-Commit-Position: refs/heads/master@{#434225}

[johnme, 2016-11-23 10:58:42]

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

[commit-bot: I haz the power, 2016-11-23 10:58:57]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[johnme, 2016-11-23 11:05:58]

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

[commit-bot: I haz the power, 2016-11-23 12:04:01]

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

[commit-bot: I haz the power, 2016-11-23 12:04:02]

Dry run: This issue passed the CQ dry run.

[stevenjb, 2016-11-23 17:06:55]

lgtm

[johnme, 2016-11-23 19:10:08]

The CQ bit was checked by johnme@chromium.org

[commit-bot: I haz the power, 2016-11-23 19:10:55]

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, 2016-11-23 19:41:53]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1479928208858460, "parent_rev":
"1b46aabf9ecae94eb2196f96c852b51b122d41ad", "commit_rev":
"5c5d3618024fdbf8394bd81fb9258ef118c1f14c"}

[commit-bot: I haz the power, 2016-11-23 19:42:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-23 19:45:25]

Description was changed from

==========
[Notifications] Make image background white like notification background

Suggested by UI reviewers, and looks a little cleaner.

BUG=668087
==========

to

==========
[Notifications] Make image background white like notification background

Suggested by UI reviewers, and looks a little cleaner.

BUG=668087

Committed: https://crrev.com/1da7201bea9f6d2cd10619638fca3f0526778d73
Cr-Commit-Position: refs/heads/master@{#434225}
==========

[commit-bot: I haz the power, 2016-11-23 19:45:26]

Patchset 1 (id:??) landed as
https://crrev.com/1da7201bea9f6d2cd10619638fca3f0526778d73
Cr-Commit-Position: refs/heads/master@{#434225}