Promote "netlog" tracing category to a default category

Promote "netlog" tracing category to a default category

This CL removes the "disabled-by-default-" prefix when logging "netlog" events
in tracing. This CL is a part of the effort to deprecate the old "net" events,
and promote the new "netlog" events.

BUG=456114
Committed: https://crrev.com/654aa66333b3a295a480542c1523ca273cfa1ad8
Cr-Commit-Position: refs/heads/master@{#318241}

[nduca, 2015-02-25 21:48:30]

nduca@chromium.org changed reviewers:
+ nduca@chromium.org

[nduca, 2015-02-25 21:48:31]

lgtm

[xunjieli, 2015-02-25 21:51:55]

xunjieli@chromium.org changed reviewers:
+ mmenke@chromium.org

[xunjieli, 2015-02-25 21:53:34]

Matt, Nat thinks it'd be best if we promote "netlog" category to a default
category first, before we start removing data in
https://codereview.chromium.org/931343002/.

Could you take a look at this one? Thanks!

[mmenke, 2015-02-25 23:48:10]

On 2015/02/25 21:53:34, xunjieli wrote:
> Matt, Nat thinks it'd be best if we promote "netlog" category to a default
> category first, before we start removing data in
> https://codereview.chromium.org/931343002/.
> 
> Could you take a look at this one? Thanks!

LGTM

[xunjieli, 2015-02-26 13:51:37]

The CQ bit was checked by xunjieli@chromium.org

[commit-bot: I haz the power, 2015-02-26 13:52:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/935723002/1

[commit-bot: I haz the power, 2015-02-26 14:11:24]

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

[commit-bot: I haz the power, 2015-02-26 14:11:25]

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

[xunjieli, 2015-02-26 15:02:38]

The CQ bit was checked by xunjieli@chromium.org

[xunjieli, 2015-02-26 15:02:38]

The patchset sent to the CQ was uploaded after l-g-t-m from nduca@chromium.org,
mmenke@chromium.org
Link to the patchset: https://codereview.chromium.org/935723002/#ps20001 (title:
"Test")

[commit-bot: I haz the power, 2015-02-26 15:03:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/935723002/20001

[commit-bot: I haz the power, 2015-02-26 16:14:43]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-26 16:15:19]

Patchset 2 (id:??) landed as
https://crrev.com/654aa66333b3a295a480542c1523ca273cfa1ad8
Cr-Commit-Position: refs/heads/master@{#318241}