Fix the appearance of Views BlueButtons with GTK theming.

ABANDONED IN FAVOR OF https://codereview.chromium.org/288983010

Fix the appearance of Views BlueButtons with GTK theming.

BlueButton instances are using the GTK borders.
This makes their white text illegible.

Use the non-GTK blue button image assets instead.
Related cleanup; before/after: http://crbug.com/375350#c2

BUG=375350
TEST=Views blue buttons look as expected.
R=erg@chromium.org,estade@chromium.org

[msw, 2014-06-03 02:15:21]

Hey Elliot and Evan, please take a look; thanks!
Ben, you may care about this, since you added BlueButton.

[Evan Stade, 2014-06-03 02:17:51]

Can you post a screenshot of the payments dialog in GTK theme mode with high
contrast inverse theme applied?

[msw, 2014-06-03 02:58:45]

On 2014/06/03 02:17:51, Evan Stade wrote:
> Can you post a screenshot of the payments dialog in GTK theme mode with high
> contrast inverse theme applied?

Done, see bug.

[Evan Stade, 2014-06-03 21:56:21]

On 2014/06/03 02:58:45, msw wrote:
> On 2014/06/03 02:17:51, Evan Stade wrote:
> > Can you post a screenshot of the payments dialog in GTK theme mode with high
> > contrast inverse theme applied?
> 
> Done, see bug.

yep, 375350_payments_after.png looks bad because the blue button is the wrong
size and flat instead of 3d. 375350_payments_inverse_after.png looks bad because
of the size and the color.

I think this patch is the wrong approach.

[msw, 2014-06-03 22:21:31]

On 2014/06/03 21:56:21, Evan Stade wrote:
> On 2014/06/03 02:58:45, msw wrote:
> > On 2014/06/03 02:17:51, Evan Stade wrote:
> > > Can you post a screenshot of the payments dialog in GTK theme mode with
high
> > > contrast inverse theme applied?
> > 
> > Done, see bug.
> 
> yep, 375350_payments_after.png looks bad because the blue button is the wrong
> size and flat instead of 3d. 375350_payments_inverse_after.png looks bad
because
> of the size and the color.
> 
> I think this patch is the wrong approach.

Abandoned.