[fsp] Pass proper data to Notify().

[fsp] Pass proper data to Notify().

This patch passes proper data instead of fake one to Notify(). Also, child
changes are now passed as a scoped_ptr and a reference to avoid unnecessary
copies.

Note, that end to end browser tests will come once notifications are wired to
chrome.fileManagerPrivate.

TEST=Tested manually.
BUG=248427
Committed: https://crrev.com/a15683665c360d910e2204198993d060163b8058
Cr-Commit-Position: refs/heads/master@{#300062}

[mtomasz, 2014-10-17 02:03:47]

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

[mtomasz, 2014-10-17 02:03:55]

@hirono: PTAL. Thanks!

[hirono, 2014-10-17 03:59:19]

lgtm!

[mtomasz, 2014-10-17 04:09:29]

On 2014/10/17 03:59:19, hirono wrote:
> lgtm!

Thanks!

[mtomasz, 2014-10-17 04:09:32]

The CQ bit was checked by mtomasz@chromium.org

[commit-bot: I haz the power, 2014-10-17 04:10:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/656393002/1

[commit-bot: I haz the power, 2014-10-17 04:22:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-17 04:22:41]

Patchset 1 (id:??) landed as
https://crrev.com/a15683665c360d910e2204198993d060163b8058
Cr-Commit-Position: refs/heads/master@{#300062}