Fix detection of clipboard change after device restart.

Fix detection of clipboard change after device restart.

BUG=None.

Committed: https://crrev.com/5498961861c9072067d94751d9f79f622c045caf
Cr-Commit-Position: refs/heads/master@{#318210}

[jif, 2015-02-25 18:08:28]

jif@chromium.org changed reviewers:
+ sdefresne@chromium.org

[jif, 2015-02-25 18:08:28]

ptal. Will add unittests in follow up CL.

[sdefresne, 2015-02-25 18:23:23]

lgtm

[jif-google, 2015-02-25 18:24:04]

The CQ bit was checked by jif@google.com

[commit-bot: I haz the power, 2015-02-25 18:24:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/954143004/1

[commit-bot: I haz the power, 2015-02-25 18:57:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-02-25 18:57:26]

Try jobs failed on following builders:
  ios_rel_device_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ng...)

[jif, 2015-02-26 08:05:49]

The CQ bit was checked by jif@chromium.org

[jif, 2015-02-26 08:05:49]

The patchset sent to the CQ was uploaded after l-g-t-m from
sdefresne@chromium.org
Link to the patchset: https://codereview.chromium.org/954143004/#ps20001 (title:
"Fix build.")

[commit-bot: I haz the power, 2015-02-26 08:07:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/954143004/20001

[commit-bot: I haz the power, 2015-02-26 08:46:28]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-26 08:47:21]

Patchset 2 (id:??) landed as
https://crrev.com/5498961861c9072067d94751d9f79f622c045caf
Cr-Commit-Position: refs/heads/master@{#318210}