Enable navigator content utils by default

Enable navigator content utils by default

NavigatorContentUtils feature was added without any status, because it was already shipped
on some platforms. When applying a runtime flag to the feature, it is not enabled by default
because it doesn't have any status. So, we need to enable the NavigatorContentUtils by default,
because it was already shipped on some platforms.

BUG=N/A

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=243026

[gyuyoung-inactive, 2013-12-27 09:05:58]

Jochen, as you may know, I'm trying to apply a runtime flag for navigator
content utils. However, some tests are failing when applying a patch on issue
110183002. To my investigation, it is caused by disabling the feature by
default. It seems to me that the navigator content utils feature needs to be
enabled by default, in order to pass existing tests.

To enable the feature by default, I enable it in
SetRuntimeFeatureDefaultsForPlatform(). I wonder if this patch can be accepted.
Could you review this patch ? If this patch can be landed, issue 110183002 will
be landed finally.

[jochen (gone - plz use gerrit), 2014-01-03 11:10:39]

lgtm

[commit-bot: I haz the power, 2014-01-04 00:08:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/gyuyoung.kim@samsung.com/121643002/1

[commit-bot: I haz the power, 2014-01-04 01:06:37]

Retried try job too often on linux_rel for step(s) check_deps2git
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2014-01-04 07:34:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/gyuyoung.kim@samsung.com/121643002/1

[commit-bot: I haz the power, 2014-01-04 12:27:04]

Change committed as 243026