Don't allow pre-MD pre-Win 10 tabstrips to overlap the toolbar corner on glass.

Don't allow pre-MD pre-Win 10 tabstrips to overlap the toolbar corner on glass.

This is basically a limited revert of an intentional behavior change.  We still
keep the new behavior in all the cases where it was beneficial.

BUG=580757
TEST=Launch Chrome on Windows 7 with no themes and with --force-device-scale-factor=2.  Ensure the tabstrip left edge doesn't look glitchily drawn atop the toolbar's rounded left corner.

Committed: https://crrev.com/5383b5d07fb0e418f13907874d801662e9668733
Cr-Commit-Position: refs/heads/master@{#371429}

[Peter Kasting, 2016-01-23 03:08:39]

pkasting@chromium.org changed reviewers:
+ sky@chromium.org

[sky, 2016-01-25 16:09:29]

LGTM

[Peter Kasting, 2016-01-26 01:49:43]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2016-01-26 01:50:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1624803002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1624803002/1

[commit-bot: I haz the power, 2016-01-26 02:38:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-26 02:39:26]

Description was changed from

==========
Don't allow pre-MD pre-Win 10 tabstrips to overlap the toolbar corner on glass.

This is basically a limited revert of an intentional behavior change.  We still
keep the new behavior in all the cases where it was beneficial.

BUG=580757
TEST=Launch Chrome on Windows 7 with no themes and with
--force-device-scale-factor=2.  Ensure the tabstrip left edge doesn't look
glitchily drawn atop the toolbar's rounded left corner.
==========

to

==========
Don't allow pre-MD pre-Win 10 tabstrips to overlap the toolbar corner on glass.

This is basically a limited revert of an intentional behavior change.  We still
keep the new behavior in all the cases where it was beneficial.

BUG=580757
TEST=Launch Chrome on Windows 7 with no themes and with
--force-device-scale-factor=2.  Ensure the tabstrip left edge doesn't look
glitchily drawn atop the toolbar's rounded left corner.

Committed: https://crrev.com/5383b5d07fb0e418f13907874d801662e9668733
Cr-Commit-Position: refs/heads/master@{#371429}
==========

[commit-bot: I haz the power, 2016-01-26 02:39:28]

Patchset 1 (id:??) landed as
https://crrev.com/5383b5d07fb0e418f13907874d801662e9668733
Cr-Commit-Position: refs/heads/master@{#371429}