Removed bg-gradient, now directly using linear-gradient

app/assets/stylesheets/common.scss

@@ -374,12 +374,12 @@ p.time {
       height: 100%;
     }
     .bar-success {
+      @include linear-gradient(#62C462, #51A351);
       background-color: #468847;
-      @include bg-gradient(#62C462, #51A351);
     }
     .bar-danger {
+      @include linear-gradient(#EE5F5B, #BD362F);
       background-color: #B94A48;
-      @include bg-gradient(#EE5F5B, #BD362F);
     }
   }
   .upvotes {

app/assets/stylesheets/gitlab_bootstrap/buttons.scss

 .btn {
-  @include bg-gradient(#f7f7f7, #d5d5d5);
+  @include linear-gradient(#f7f7f7, #d5d5d5);
   border-color: #aaa;
   &:hover {
     @include bg-gray-gradient;
@@ -9,7 +9,7 @@
   &.primary {
     background: #2a79A3;
-    @include bg-gradient(#47A7b7, #2585b5);
+    @include linear-gradient(#47A7b7, #2585b5);
     border-color: #2A79A3;
     color: #fff;
     text-shadow: 0 1px 1px #268;

app/assets/stylesheets/mixins.scss

@@ -34,10 +34,6 @@
   background-image: -o-linear-gradient($from, $to);
 }
-@mixin bg-gradient($from, $to) {
-  @include linear-gradient($from, $to);
-}
-
 @mixin bg-light-gray-gradient {
   background: #f1f1f1;
   background-image: -webkit-gradient(linear, 0 0, 0 30, color-stop(0.066, #f5f5f5), to(#e1e1e1));