Revert of Linux UI: Switch to the Gtk3 theme

Revert of Linux UI: Switch to the Gtk3 theme (patchset #2 id:160001 of https://codereview.chromium.org/2670623002/ )

Reason for revert:
Broke MSAN bots and ClusterFuzz bots.

BUG=698239, 698252
Original issue's description:
> Linux UI: Switch to the Gtk3 theme
> 
> Sets "use_gtk3 = true" by default.
> 
> BUG=79722
> TBR=dpranke@chromium.org
> 
> > Review-Url: https://codereview.chromium.org/2670623002
> > Cr-Commit-Position: refs/heads/master@{#452118}
> > Committed: https://chromium.googlesource.com/chromium/src/+/872a494bba52e597388aec738d9d681183a3d47b
> 
> Review-Url: https://codereview.chromium.org/2670623002
> Cr-Commit-Position: refs/heads/master@{#454491}
> Committed: https://chromium.googlesource.com/chromium/src/+/89be63a39b5014096115d3ec60d13fde39e73283

TBR=erg@chromium.org,mmoss@chromium.org,thomasanderson@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=79722
Review-Url: https://codereview.chromium.org/2722313008
Cr-Commit-Position: refs/heads/master@{#454606}
Committed: https://chromium.googlesource.com/chromium/src/+/d75f748f806d61b22012c723d63322afb2ff7208

[inferno, 2017-03-03 17:15:33]

The CQ bit was checked by inferno@chromium.org

[inferno, 2017-03-03 17:15:34]

Created Revert of Linux UI: Switch to the Gtk3 theme

[commit-bot: I haz the power, 2017-03-03 17:16:04]

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, 2017-03-03 17:17:50]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488561333993030, "parent_rev":
"2b84baf7219874baadaadee3917f52a1cd4dfee2", "commit_rev":
"d75f748f806d61b22012c723d63322afb2ff7208"}

[commit-bot: I haz the power, 2017-03-03 17:18:30]

Description was changed from

==========
Revert of Linux UI: Switch to the Gtk3 theme (patchset #2 id:160001 of
https://codereview.chromium.org/2670623002/ )

Reason for revert:
Broke MSAN bots and ClusterFuzz bots.

BUG=698239,698252

Original issue's description:
> Linux UI: Switch to the Gtk3 theme
> 
> Sets "use_gtk3 = true" by default.
> 
> BUG=79722
> TBR=dpranke@chromium.org
> 
> > Review-Url: https://codereview.chromium.org/2670623002
> > Cr-Commit-Position: refs/heads/master@{#452118}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/872a494bba52e597388aec738d9d...
> 
> Review-Url: https://codereview.chromium.org/2670623002
> Cr-Commit-Position: refs/heads/master@{#454491}
> Committed:
https://chromium.googlesource.com/chromium/src/+/89be63a39b5014096115d3ec60d1...

TBR=erg@chromium.org,mmoss@chromium.org,thomasanderson@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=79722
==========

to

==========
Revert of Linux UI: Switch to the Gtk3 theme (patchset #2 id:160001 of
https://codereview.chromium.org/2670623002/ )

Reason for revert:
Broke MSAN bots and ClusterFuzz bots.

BUG=698239,698252

Original issue's description:
> Linux UI: Switch to the Gtk3 theme
> 
> Sets "use_gtk3 = true" by default.
> 
> BUG=79722
> TBR=dpranke@chromium.org
> 
> > Review-Url: https://codereview.chromium.org/2670623002
> > Cr-Commit-Position: refs/heads/master@{#452118}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/872a494bba52e597388aec738d9d...
> 
> Review-Url: https://codereview.chromium.org/2670623002
> Cr-Commit-Position: refs/heads/master@{#454491}
> Committed:
https://chromium.googlesource.com/chromium/src/+/89be63a39b5014096115d3ec60d1...

TBR=erg@chromium.org,mmoss@chromium.org,thomasanderson@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=79722

Review-Url: https://codereview.chromium.org/2722313008
Cr-Commit-Position: refs/heads/master@{#454606}
Committed:
https://chromium.googlesource.com/chromium/src/+/d75f748f806d61b22012c723d633...
==========

[commit-bot: I haz the power, 2017-03-03 17:18:31]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/d75f748f806d61b22012c723d633...