Remove some dead code about "acknowledged types"

Remove some dead code about "acknowledged types"

Sync no longer has a concept of "acknowledged types".

BUG=352818
R=stanisc@chromium.org, maniscalco@chromium.org

Committed: https://crrev.com/7bacc80478c18753ae65d92b361812cc95fc9ff8
Cr-Commit-Position: refs/heads/master@{#317989}

[maniscalco, 2015-02-13 17:20:30]

Thanks for cleaning this up!  LGTM.  Note, I made a small change to the commit
message.

[zhuoyu.qian, 2015-02-15 08:07:51]

The CQ bit was checked by zhuoyu.qian@samsung.com

[commit-bot: I haz the power, 2015-02-15 08:08:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/919383002/1

[commit-bot: I haz the power, 2015-02-15 08:10:44]

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

[commit-bot: I haz the power, 2015-02-15 08:10:45]

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

[zhuoyu.qian, 2015-02-25 05:11:41]

The CQ bit was checked by zhuoyu.qian@samsung.com

[zhuoyu.qian, 2015-02-25 05:11:41]

The patchset sent to the CQ was uploaded after l-g-t-m from
maniscalco@chromium.org
Link to the patchset: https://codereview.chromium.org/919383002/#ps20001 (title:
"rebase")

[commit-bot: I haz the power, 2015-02-25 05:12:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/919383002/20001

[commit-bot: I haz the power, 2015-02-25 05:52:50]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-25 05:53:44]

Patchset 2 (id:??) landed as
https://crrev.com/7bacc80478c18753ae65d92b361812cc95fc9ff8
Cr-Commit-Position: refs/heads/master@{#317989}