Mechanical rename of base::debug -> base::trace_event for /content

Mechanical rename of base::debug -> base::trace_event for /content

This is the last stage of the trace_event directory restructuring.
This is part of a set of 3 CLs which is moving tracing clients to use
the new base::trace_event namespace.
See crrev.com/837303004 and the related bug for motivations.

BUG=451032
TBR=jam@chromium.org
NOTRY=true

Committed: https://crrev.com/b2e3ececdfdc5ce1037d1bb648a7ff0f1d38f508
Cr-Commit-Position: refs/heads/master@{#315310}

[ssid, 2015-02-03 15:49:16]

ssid@chromium.org changed reviewers:
+ picksi@chromium.org, primiano@chromium.org

[ssid, 2015-02-03 15:49:16]

This is for renaming namespace usages in /content folder

[Primiano Tucci (use gerrit), 2015-02-03 19:07:05]

The changes look good but I think that you forgot to revert the forward
declarations marked with the TODO introduced in crrev.com/882673002, which
specifically are:

content/browser/browser_main_loop.h
content/child/child_thread.h
content/renderer/scheduler/renderer_scheduler_impl.h
content/renderer/scheduler/task_queue_manager.h
content/renderer/scheduler/task_queue_selector.h

[ssid, 2015-02-03 21:13:13]

On 2015/02/03 19:07:05, Primiano Tucci wrote:
> The changes look good but I think that you forgot to revert the forward
> declarations marked with the TODO introduced in crrev.com/882673002, which
> specifically are:
> 
> content/browser/browser_main_loop.h
> content/child/child_thread.h
> content/renderer/scheduler/renderer_scheduler_impl.h
> content/renderer/scheduler/task_queue_manager.h
> content/renderer/scheduler/task_queue_selector.h

Removed the extra declarations.

[Primiano Tucci (use gerrit), 2015-02-09 11:34:25]

Thanks for the massive work.
PS4 (#60001) LGTM.

TBR-ing jam@ for /content changes. Reason for TBR:
 - This consists of purely mechanical changes.
 - The changes are of the same nature made in the other similar CLs, which have
been approved by tracing OWNERs (e.g., crrev.com/882673002, crrev.com/879913002)
 - I have reviewed the CL and verified that after that, no more references to
base::debug::*trace* are left in content/ and the TODOs introduced in
crrev.com/882673002 have been removed.
 - Given the widespread nature of the change, it is much easier to get this
landed in EMEA timezone, when the tree is quieter.

If this patch screwed up something, may the rage of content/ owners fall on me.

[Primiano Tucci (use gerrit), 2015-02-09 11:34:31]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2015-02-09 11:35:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/892213004/60001

[Primiano Tucci (use gerrit), 2015-02-09 11:40:25]

The CQ bit was unchecked by primiano@chromium.org

[Primiano Tucci (use gerrit), 2015-02-09 11:40:34]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2015-02-09 11:41:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/892213004/60001

[commit-bot: I haz the power, 2015-02-09 13:10:03]

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

[commit-bot: I haz the power, 2015-02-09 13:10:04]

Try jobs failed on following builders:
  ios_dbg_simulator on tryserver.chromium.mac (JOB_TIMED_OUT, no build URL)
  ios_rel_device_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build URL)
  ios_rel_device_ninja_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build
URL)
Timed out jobs are not retried to avoid causing additional load on the builders
with large pending queues.

[Primiano Tucci (use gerrit), 2015-02-09 16:00:06]

Adding NOTRY.
Apparently the ios bot on the CQ are in a very sorry state.
I notified troppers, but in the meanwhile I don't see any other solution than
NOTRY

[Primiano Tucci (use gerrit), 2015-02-09 16:00:14]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2015-02-09 16:00:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/892213004/60001

[commit-bot: I haz the power, 2015-02-09 16:02:27]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-02-09 16:03:28]

Patchset 4 (id:??) landed as
https://crrev.com/b2e3ececdfdc5ce1037d1bb648a7ff0f1d38f508
Cr-Commit-Position: refs/heads/master@{#315310}