css: remove obsolete/unused mixins.

app/javascript/src/styles/base/000_vars.scss

@@ -33,40 +33,6 @@ $note_highlight_color: $preview_pending_color;
 $error_color: hsl(0, 100%, 95%); // light red
 $success_color: hsl(120, 100%, 95%); // light green
 
-@mixin border-radius($val) {
-  -moz-border-radius: $val;
-  -webkit-border-radius: $val;
-  -ms-border-radius: $val;
-  -o-border-radius: $val;
-  border-radius: $val;
-}
-
-@mixin box-shadow($val) {
-  -moz-box-shadow: $val;
-  -webkit-box-shadow: $val;
-  -ms-box-shadow: $val;
-  -o-box-shadow: $val;
-  box-shadow: $val;
-}
-
-@mixin text-shadow($val) {
-  -moz-text-shadow: $val;
-  -webkit-text-shadow: $val;
-  -ms-text-shadow: $val;
-  -o-text-shadow: $val;
-  text-shadow: $val;
-}
-
-@mixin inline-block {
-  display: -moz-inline-box;
-  -moz-box-orient: vertical;
-  display: inline-block;
-  vertical-align: baseline;
-  zoom: 1;
-  *display: inline;
-  *vertical-align: auto;
-}
-
 @mixin animated-icon {
   content: "►";
   position: absolute;

app/javascript/src/styles/common/inline.scss

@@ -30,8 +30,8 @@ kbd.key {
   color: white;
 /*  width: 1em;*/
   text-align: center;
-  @include inline-block;
+  display: inline-block;
-  @include border-radius(3px);
+  border-radius: 3px;
 }
 
 span.inactive {

app/javascript/src/styles/specific/pools.scss

@@ -69,7 +69,7 @@ div#c-pool-orders, div#c-favorite-group-orders {
         min-width: 150px;
         min-height: 150px;
         padding: 10px;
-        @include inline-block;
+        display: inline-block;
       }
 
       li.ui-state-default {

app/javascript/src/styles/specific/posts.scss

@@ -6,11 +6,11 @@ article.post-preview {
   margin: 0 10px 10px 0;
   overflow: hidden;
   text-align: center;
-  @include inline-block;
+  display: inline-block;
   position: relative;
 
   a {
-    @include inline-block;
+    display: inline-block;
   }
 
   &.captioned {