Revert broken Linux hidpi changes.

Revert broken Linux hidpi changes.

This reverts the following:

  commit 5cb0c01e4233ff3eb1e7f6f677b4cf9dae9ffaf2
  Author: oshima <oshima@chromium.org>;
  Date:   Fri May 15 15:16:07 2015 -0700

      Compute the base dpi from X

  commit 42de8ba1ba55502417670a820b5bd57017a6cd29
  Author: oshima <oshima@chromium.org>;
  Date:   Wed Jul 22 15:17:49 2015 -0700

      Use org.gnome.desktop.interface text-scaling-factor directly

R=oshima@chromium.org, stapelberg@google.com
BUG=485183
Committed: https://crrev.com/6b72d5275f43b0fdcaa6029859e5e506f005c7bb
Cr-Commit-Position: refs/heads/master@{#342381}

[Michael Moss, 2015-08-06 23:00:45]

Note, this wasn't a 100% clean revert, since there were several intervening
changes. Please check carefully that the logic is back to how you wanted it.

[Michael Moss, 2015-08-06 23:01:22]

mmoss@chromium.org changed reviewers:
+ oshima@chromium.org
- oshima@google.com

[stapelberg, 2015-08-07 10:38:22]

lgtm

https://codereview.chromium.org/1276553007/diff/1/chrome/browser/ui/libgtk2ui...
File chrome/browser/ui/libgtk2ui/gtk2_ui.cc (right):

https://codereview.chromium.org/1276553007/diff/1/chrome/browser/ui/libgtk2ui...
chrome/browser/ui/libgtk2ui/gtk2_ui.cc:53: #include "ui/gfx/x/x11_types.h"
You might be able to remove the x11_types.h include, as it was added with
https://codereview.chromium.org/1136913005/diff/200001/chrome/browser/ui/libg...

https://codereview.chromium.org/1276553007/diff/1/chrome/browser/ui/libgtk2ui...
chrome/browser/ui/libgtk2ui/gtk2_ui.cc:1444: return roundf(scale * 100) / 100;
I think we should keep the rounding to 1 decimal, i.e.

// Round to 1 decimal, e.g. to 1.4.
return roundf(scale * 10) / 10;

[Michael Moss, 2015-08-07 16:45:40]

https://codereview.chromium.org/1276553007/diff/1/chrome/browser/ui/libgtk2ui...
File chrome/browser/ui/libgtk2ui/gtk2_ui.cc (right):

https://codereview.chromium.org/1276553007/diff/1/chrome/browser/ui/libgtk2ui...
chrome/browser/ui/libgtk2ui/gtk2_ui.cc:53: #include "ui/gfx/x/x11_types.h"
On 2015/08/07 10:38:22, stapelberg wrote:
> You might be able to remove the x11_types.h include, as it was added with
>
https://codereview.chromium.org/1136913005/diff/200001/chrome/browser/ui/libg...

Done.

https://codereview.chromium.org/1276553007/diff/1/chrome/browser/ui/libgtk2ui...
chrome/browser/ui/libgtk2ui/gtk2_ui.cc:1444: return roundf(scale * 100) / 100;
On 2015/08/07 10:38:22, stapelberg wrote:
> I think we should keep the rounding to 1 decimal, i.e.
> 
> // Round to 1 decimal, e.g. to 1.4.
> return roundf(scale * 10) / 10;

Done.

[Michael Moss, 2015-08-07 16:46:36]

mmoss@chromium.org changed reviewers:
+ erg@chromium.org

[Michael Moss, 2015-08-07 16:46:36]

+erg for OWNERS

[Michael Moss, 2015-08-07 17:10:10]

The CQ bit was checked by mmoss@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-07 17:10:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1276553007/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1276553007/20001

[Elliot Glaysher, 2015-08-07 17:20:02]

lgtm

[commit-bot: I haz the power, 2015-08-07 17:50:43]

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

[commit-bot: I haz the power, 2015-08-07 17:50:44]

Dry run: This issue passed the CQ dry run.

[Michael Moss, 2015-08-07 17:55:01]

The CQ bit was checked by mmoss@chromium.org

[Michael Moss, 2015-08-07 17:55:01]

The patchset sent to the CQ was uploaded after l-g-t-m from
stapelberg@google.com
Link to the patchset: https://codereview.chromium.org/1276553007/#ps20001
(title: "review fixes")

[commit-bot: I haz the power, 2015-08-07 17:56:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1276553007/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1276553007/20001

[commit-bot: I haz the power, 2015-08-07 18:05:18]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-07 18:06:06]

Patchset 2 (id:??) landed as
https://crrev.com/6b72d5275f43b0fdcaa6029859e5e506f005c7bb
Cr-Commit-Position: refs/heads/master@{#342381}