Don't show import buttons when import is disabled, and use correct icons for insufficient space sta…

Don't show import buttons when import is disabled, and use correct icons for insufficient space state (were inverted).

BUG=468971
TEST=manual

Committed: https://crrev.com/7547b20c9a1a39f5cdf9f44dd0a60b18abd00e94
Cr-Commit-Position: refs/heads/master@{#321473}

[Steve McKay, 2015-03-19 23:27:40]

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

[Steve McKay, 2015-03-19 23:28:08]

Feel free to hit the commit box.

[Ben Kwa, 2015-03-19 23:29:06]

The CQ bit was checked by kenobi@chromium.org

[Ben Kwa, 2015-03-19 23:29:06]

lgtm

[commit-bot: I haz the power, 2015-03-19 23:29:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1020083002/1

[commit-bot: I haz the power, 2015-03-20 00:02:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-20 00:02:47]

Patchset 1 (id:??) landed as
https://crrev.com/7547b20c9a1a39f5cdf9f44dd0a60b18abd00e94
Cr-Commit-Position: refs/heads/master@{#321473}