Make the Cloud import banner match Material Design specs.

Make the Cloud import banner match Material Design specs.

The rounded corners should be 2px, and for the shadow a paper-shadow Polymer
element can be used.

TEST=Tested manually.
BUG=None

Committed: https://crrev.com/5b31b2902e451d2ee687c58f14d09acad88e7946
Cr-Commit-Position: refs/heads/master@{#318064}

[mtomasz, 2015-02-25 09:19:21]

mtomasz@chromium.org changed reviewers:
+ smckay@chromium.org

[mtomasz, 2015-02-25 09:19:41]

@smckay: PTAL. Thanks.

[Steve McKay, 2015-02-25 16:23:19]

The CQ bit was checked by smckay@chromium.org

[Steve McKay, 2015-02-25 16:23:20]

lgtm

[Steve McKay, 2015-02-25 16:23:30]

Thanks!

[commit-bot: I haz the power, 2015-02-25 16:23:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/956563006/1

[commit-bot: I haz the power, 2015-02-25 17:01:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-25 17:02:28]

Patchset 1 (id:??) landed as
https://crrev.com/5b31b2902e451d2ee687c58f14d09acad88e7946
Cr-Commit-Position: refs/heads/master@{#318064}