Fix more tests in the import history.

Fix more tests in the import history.

Promises were not chained properly. As a
result, the majority of tests were always passing despite of errors.

TEST=browser_tests: *ImportHistoryTest*
BUG=None

Committed: https://crrev.com/cb481279b165f1b2155276a48c698dc5df980df3
Cr-Commit-Position: refs/heads/master@{#312972}

[mtomasz, 2015-01-23 23:01:06]

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

[mtomasz, 2015-01-23 23:01:39]

@smckay: PTAL.

[Steve McKay, 2015-01-23 23:04:33]

lgtm

[mtomasz, 2015-01-23 23:05:18]

The CQ bit was checked by mtomasz@chromium.org

[commit-bot: I haz the power, 2015-01-23 23:06:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/867123007/1

[mtomasz, 2015-01-23 23:07:52]

On 2015/01/23 23:04:33, Steve McKay wrote:
> lgtm

Other test files look OK.

[commit-bot: I haz the power, 2015-01-24 00:00:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-24 00:01:51]

Patchset 1 (id:??) landed as
https://crrev.com/cb481279b165f1b2155276a48c698dc5df980df3
Cr-Commit-Position: refs/heads/master@{#312972}