add missing headers in child tracing code

add missing headers in components/tracing/child_trace_message_filter.h and 
content/child/child_resource_message_filter.cc

BUG=259043
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=211542

[Mostyn Bramley-Moore, 2013-07-11 09:33:58]

@jbauman: PTAL at this trivial patch...

[jbauman, 2013-07-11 21:00:02]

lgtm

[commit-bot: I haz the power, 2013-07-12 03:33:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mostynb@opera.com/18863004/2001

[commit-bot: I haz the power, 2013-07-12 03:50:19]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[Mostyn Bramley-Moore, 2013-07-12 07:11:20]

@creis: can you take a quick look at
content/child/child_resource_message_filter.cc ?

[Charlie Reis, 2013-07-12 17:18:11]

Sure.  content/child/child_resource_message_filter.cc LGTM.

[commit-bot: I haz the power, 2013-07-12 18:01:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mostynb@opera.com/18863004/2001

[commit-bot: I haz the power, 2013-07-12 19:27:13]

Retried try job too often on mac_rel for step(s) sync_integration_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-07-12 19:30:38]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mostynb@opera.com/18863004/2001

[commit-bot: I haz the power, 2013-07-13 04:31:53]

Change committed as 211542