[epiphany] theme: Avoid CSS error

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 1f49d03b760e29e431275f22507c895f76d995af
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri Jan 8 14:07:19 2016 -0600

    theme: Avoid CSS error

 src/resources/epiphany.css  |    2 +-
 src/resources/epiphany.scss |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/resources/epiphany.css b/src/resources/epiphany.css
index 17164d4..5deb6a0 100644
--- a/src/resources/epiphany.css
+++ b/src/resources/epiphany.css
@@ -26,7 +26,7 @@ button.active-menu {
 .incognito-mode.titlebar {
   background-image: linear-gradient(to top, #a5b1bd, #c5cdd5 2px, #cbd2d9 3px);
   box-shadow: inset 0 1px #f1f3f5;
-  background-image: -gtk-icontheme("user-not-tracked-symbolic"), headerbar_gradient(#cbd2d9);
+  background-image: -gtk-icontheme("user-not-tracked-symbolic"), linear-gradient(#cbd2d9);
   background-size: 64px 64px, 100% 100%;
   background-position: 160px 0, 0 0;
   background-repeat: no-repeat, no-repeat;
diff --git a/src/resources/epiphany.scss b/src/resources/epiphany.scss
index 1ff14bd..3f87356 100644
--- a/src/resources/epiphany.scss
+++ b/src/resources/epiphany.scss
@@ -46,7 +46,7 @@ $edge_color: lighten($incognito_color, 13%);
   &.titlebar {
     @include headerbar_fill($incognito_color, $hc:$edge_color);
     background-image: -gtk-icontheme($incognito_icon),
-                      headerbar_gradient($incognito_color);
+                      linear-gradient($incognito_color);
     background-size: 64px 64px, 100% 100%;
     background-position: 160px 0, 0 0;
     background-repeat: no-repeat, no-repeat;