Linux: don't use the DBus power save blocker if DPMS is disabled.

Linux: don't use the DBus power save blocker if DPMS is disabled.
On some desktop environments, this can enable DPMS with poor defaults.

Also reformat a bunch of poorly-wrapped comments.

BUG=111239
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=133874

[sky, 2012-04-25 03:37:26]

This looks reasonable to me, but I don't know anything about this code. Is there
someone more knowledgeable about it that could do the review?

[Mike Mammarella, 2012-04-25 03:44:53]

On 2012/04/25 03:37:26, sky wrote:
> This looks reasonable to me, but I don't know anything about this code. Is
there
> someone more knowledgeable about it that could do the review?

I don't think so, unfortunately. This code was contributed to the project, and I
reviewed it. So I'm pretty much that person. :)

There may be somebody familiar with the X library calls in DPMSEnabled() if we
ask around, but I looked at the source of "xset" to find out how to do this, so
I'm fairly certain that this is the appropriate way to check for the status of
DPMS.

[sky, 2012-04-25 03:59:10]

LGTM

[commit-bot: I haz the power, 2012-04-25 04:00:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mdm@chromium.org/10218008/1

[commit-bot: I haz the power, 2012-04-25 05:29:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mdm@chromium.org/10218008/8003

[commit-bot: I haz the power, 2012-04-25 08:09:19]

Change committed as 133874