Linux: fix Gtk3 compile when using wheezy sysroot

Linux: fix Gtk3 compile when using wheezy sysroot

This CL uses a GtkMenu insetad of a GtkHeaderBar to get the frame
color.  Additionally, we use a 1x1px widget since a menu has a uniform
color.

In the future, this code must be refactored further, but this is just
to fix the build so we can get a trybot config set up.

BUG=132847
R=erg@chromium.org

Committed: https://crrev.com/1ec85106b90c41fe1f3e0635c7c38cb0db98dbd8
Cr-Commit-Position: refs/heads/master@{#426929}

[Tom (Use chromium acct), 2016-10-21 21:10:51]

erg PTAL

Besides what we changed earlier, I also made the widget 1x1px.  It works on my
system, but I'm not sure if it will work in general.

[Elliot Glaysher, 2016-10-21 21:22:10]

lgtm

[Tom (Use chromium acct), 2016-10-21 21:27:24]

The CQ bit was checked by thomasanderson@google.com

[commit-bot: I haz the power, 2016-10-21 21:28:04]

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

[commit-bot: I haz the power, 2016-10-21 21:28:05]

This CL has an open dependency (Issue 2444473002 Patch 1). Please resolve the
dependency and try again.
If you are sure that there is no real dependency, please use one of the options
listed in https://goo.gl/9Es4OR to land the CL.

[Tom (Use chromium acct), 2016-10-21 22:13:21]

The CQ bit was checked by thomasanderson@google.com

[commit-bot: I haz the power, 2016-10-21 22:14:15]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-21 23:48:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-21 23:52:52]

Description was changed from

==========
Linux: fix Gtk3 compile when using wheezy sysroot

This CL uses a GtkMenu insetad of a GtkHeaderBar to get the frame
color.  Additionally, we use a 1x1px widget since a menu has a uniform
color.

In the future, this code must be refactored further, but this is just
to fix the build so we can get a trybot config set up.

BUG=132847
R=erg@chromium.org
==========

to

==========
Linux: fix Gtk3 compile when using wheezy sysroot

This CL uses a GtkMenu insetad of a GtkHeaderBar to get the frame
color.  Additionally, we use a 1x1px widget since a menu has a uniform
color.

In the future, this code must be refactored further, but this is just
to fix the build so we can get a trybot config set up.

BUG=132847
R=erg@chromium.org

Committed: https://crrev.com/1ec85106b90c41fe1f3e0635c7c38cb0db98dbd8
Cr-Commit-Position: refs/heads/master@{#426929}
==========

[commit-bot: I haz the power, 2016-10-21 23:52:54]

Patchset 1 (id:??) landed as
https://crrev.com/1ec85106b90c41fe1f3e0635c7c38cb0db98dbd8
Cr-Commit-Position: refs/heads/master@{#426929}