Update default browser infobar for MD

Update default browser infobar for MD

Also tweak the color and size of the icon to better match mocks. The previous
size of 16 was based on the geolocation icon, which has been confirmed as
erroneously large (something we should address separately).

Also change the type of the infobar to normal from warning (this affects MD and pre-MD).

BUG=520266
TBR=sky@chromium.org

Committed: https://crrev.com/9513208dda6d8e9f355f622165c17432b87a9f3e
Cr-Commit-Position: refs/heads/master@{#351354}

[Evan Stade, 2015-09-28 19:20:32]

estade@chromium.org changed reviewers:
+ pkasting@chromium.org

[Peter Kasting, 2015-09-28 22:56:22]

LGTM

[Evan Stade, 2015-09-28 23:03:48]

The CQ bit was checked by estade@chromium.org

[commit-bot: I haz the power, 2015-09-28 23:06:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377553002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377553002/20001

[commit-bot: I haz the power, 2015-09-28 23:21:03]

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

[commit-bot: I haz the power, 2015-09-28 23:21:03]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Evan Stade, 2015-09-29 17:43:03]

estade@chromium.org changed reviewers:
+ sky@chromium.org

[Evan Stade, 2015-09-29 17:43:03]

+sky TBR for ui/gfx/BUILD.gn

[Evan Stade, 2015-09-29 17:43:35]

The CQ bit was checked by estade@chromium.org

[commit-bot: I haz the power, 2015-09-29 17:45:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377553002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377553002/20001

[commit-bot: I haz the power, 2015-09-29 18:11:50]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-29 18:13:06]

Patchset 2 (id:??) landed as
https://crrev.com/9513208dda6d8e9f355f622165c17432b87a9f3e
Cr-Commit-Position: refs/heads/master@{#351354}