Files.app: Use "ready" message for waiting initialization in SelectFileAndCancel test.

Files.app: Use "ready" message instead of "worker-initialized" for waiting initialization in SelectFileAndCancel test.

The current message "worker-initialized" does not ensure the whole initialize
process completed in Files.app, and it causes races in the test after the
refactoring of crbug.com/267281.

BUG=432029
TEST=Run SelectFileAndCancel

Committed: https://crrev.com/8866b6d59454363b687d8c6b099d6c663a78d66c
Cr-Commit-Position: refs/heads/master@{#303788}

[hirono, 2014-11-11 07:29:42]

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

[hirono, 2014-11-11 07:29:43]

PTAL the CL? Thanks!

[yawano, 2014-11-11 08:01:58]

lgtm.

[hirono, 2014-11-11 09:38:21]

The CQ bit was checked by hirono@chromium.org

[hirono, 2014-11-11 09:38:29]

The CQ bit was unchecked by hirono@chromium.org

[hirono, 2014-11-11 09:38:33]

On 2014/11/11 08:01:58, yawano wrote:
> lgtm.

Thanks!

[hirono, 2014-11-11 09:40:21]

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

[hirono, 2014-11-11 09:40:22]

@sky - PTAL the CL? Thanks!

[sky, 2014-11-11 16:52:15]

LGTM

[hirono, 2014-11-12 04:01:07]

The CQ bit was checked by hirono@chromium.org

[hirono, 2014-11-12 04:01:13]

On 2014/11/11 16:52:15, sky wrote:
> LGTM

Thanks!

[commit-bot: I haz the power, 2014-11-12 04:02:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/714813002/10002

[commit-bot: I haz the power, 2014-11-12 04:46:04]

Committed patchset #2 (id:10002)

[commit-bot: I haz the power, 2014-11-12 04:46:39]

Patchset 2 (id:??) landed as
https://crrev.com/8866b6d59454363b687d8c6b099d6c663a78d66c
Cr-Commit-Position: refs/heads/master@{#303788}