Debugger: clean up debug events.

Debugger: clean up debug events.

The debug event BreakForCommand is now deprecated, as it cannot happen any longer.

R=ulan@chromium.org

Committed: https://crrev.com/10b979e6aaf9b39867497773b09c28aea9a71620
Cr-Commit-Position: refs/heads/master@{#28071}

[Yang, 2015-04-17 11:54:33]

On 2015/04/16 13:23:33, Yang wrote:

ping

[Yang, 2015-04-17 13:04:58]

The CQ bit was checked by yangguo@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-04-17 13:05:07]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1089893002/1

[commit-bot: I haz the power, 2015-04-17 13:45:58]

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

[commit-bot: I haz the power, 2015-04-17 13:45:59]

Dry run: This issue passed the CQ dry run.

[Yang, 2015-04-20 06:42:37]

On 2015/04/17 13:45:59, I haz the power (commit-bot) wrote:
> Dry run: This issue passed the CQ dry run.

ping

[Yang, 2015-04-23 13:28:40]

On 2015/04/20 06:42:37, Yang wrote:
> On 2015/04/17 13:45:59, I haz the power (commit-bot) wrote:
> > Dry run: This issue passed the CQ dry run.
> 
> ping

ping.

[ulan, 2015-04-24 14:39:18]

lgtm if you add comment in description about breaking API change.

[Yang, 2015-04-27 10:51:42]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-04-27 10:51:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1089893002/1

[commit-bot: I haz the power, 2015-04-27 11:06:17]

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

[commit-bot: I haz the power, 2015-04-27 11:06:17]

Try jobs failed on following builders:
  v8_win64_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win64_rel/builds/4210)

[Yang, 2015-04-27 11:46:52]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-04-27 11:46:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1089893002/1

[commit-bot: I haz the power, 2015-04-27 12:10:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-27 12:10:41]

Patchset 1 (id:??) landed as
https://crrev.com/10b979e6aaf9b39867497773b09c28aea9a71620
Cr-Commit-Position: refs/heads/master@{#28071}