Enable hi-dpi support on Linux.

Enable hi-dpi support on Linux.

With the recent bugfixes (see BUG=), hi-dpi support on Linux works well enough
to enable it by default.

BUG=143619
Committed: https://crrev.com/a27daaff43d65055a62aee8aca3415901ec3eb33
Cr-Commit-Position: refs/heads/master@{#321865}

[stapelberg, 2015-03-23 16:26:40]

stapelberg@google.com changed reviewers:
+ sadrul@chromium.org, scottmg@chromium.org

[sadrul, 2015-03-23 16:31:39]

I think you need to update build/config/ui.gni too?

[stapelberg, 2015-03-23 16:34:05]

On 2015/03/23 16:31:39, sadrul wrote:
> I think you need to update build/config/ui.gni too?

Done.

[sadrul, 2015-03-23 16:37:13]

We can probably just get rid of this flag (and ENABLE_HIDPI) now. But we should
wait until this hits stable I guess?

lgtm

[scottmg, 2015-03-23 18:52:56]

lgtm

[stapelberg, 2015-03-23 18:53:17]

The CQ bit was checked by stapelberg@google.com

[commit-bot: I haz the power, 2015-03-23 18:53:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1028703004/20001

[commit-bot: I haz the power, 2015-03-23 21:47:58]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-23 21:48:50]

Patchset 2 (id:??) landed as
https://crrev.com/a27daaff43d65055a62aee8aca3415901ec3eb33
Cr-Commit-Position: refs/heads/master@{#321865}