Eliminate last vestigages of the command system design.

Eliminate last vestiges of the command system design.

Update ImportController to push all updates to a new 'CommandWidget' class. Add more test coverage.

BUG=420680
TEST=browser_test: FileManagerJsTest.*

Committed: https://crrev.com/d4f3217ab2f151f6e2a6be52fe947672813d3c58
Cr-Commit-Position: refs/heads/master@{#313622}

[Steve McKay, 2015-01-28 16:36:47]

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

[Steve McKay, 2015-01-28 17:42:39]

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

[Steve McKay, 2015-01-28 17:42:39]

Reviews: Fukino-san || Tomasz...which ever is first.

[Ben Kwa, 2015-01-28 18:16:01]

lgtm

[mtomasz, 2015-01-28 18:35:16]

On 2015/01/28 18:16:01, Ben Kwa wrote:
> lgtm

nit: Please keep the CL description:

Short title\n\nDescription\n\nBUG=\nTEST=\n

[Steve McKay, 2015-01-28 18:41:14]

On 2015/01/28 18:35:16, mtomasz wrote:
> On 2015/01/28 18:16:01, Ben Kwa wrote:
> > lgtm
> 
> nit: Please keep the CL description:
> 
> Short title\n\nDescription\n\nBUG=\nTEST=\n

Done.

[Steve McKay, 2015-01-28 18:42:00]

smckay@chromium.org changed reviewers:
- fukino@chromium.org

[Steve McKay, 2015-01-28 20:46:13]

Merge w/ master.

[mtomasz, 2015-01-28 22:54:03]

lgtm

https://codereview.chromium.org/880303002/diff/20001/ui/file_manager/file_man...
File ui/file_manager/file_manager/foreground/js/import_controller.js (right):

https://codereview.chromium.org/880303002/diff/20001/ui/file_manager/file_man...
ui/file_manager/file_manager/foreground/js/import_controller.js:470: 
nit: remove \n

[Steve McKay, 2015-01-28 23:14:50]

Respond to review comments.

[Steve McKay, 2015-01-28 23:14:53]

The CQ bit was checked by smckay@chromium.org

[Steve McKay, 2015-01-28 23:15:18]

Dones. Thanks.

[commit-bot: I haz the power, 2015-01-28 23:16:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/880303002/40001

[commit-bot: I haz the power, 2015-01-28 23:53:15]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-01-28 23:54:20]

Patchset 3 (id:??) landed as
https://crrev.com/d4f3217ab2f151f6e2a6be52fe947672813d3c58
Cr-Commit-Position: refs/heads/master@{#313622}