remove ancient unused css

app/assets/stylesheets/common/admin/admin_base.scss

@@ -1037,102 +1037,6 @@ table.api-keys {
   }
 }
 
-.commits-widget {
-  border: solid 1px $primary-low;
-  height: 180px;
-  margin-bottom: 36px;
-
-  ul, li {
-    margin: 0;
-    padding: 0;
-  }
-  ul {
-    list-style: none;
-  }
-  a {
-    color: $primary;
-    text-decoration: none;
-  }
-  a:hover {
-    text-decoration: underline;
-  }
-
-  .header {
-    color: $primary;
-    font-weight: bold;
-    height: 30px;
-    background: $primary-low;
-    cursor: pointer;
-
-    h1 {
-      font-size: 1.286em;
-      margin: 5px 0 0 8px;
-      display: inline-block;
-      line-height: 1.0em;
-    }
-  }
-
-  .header:hover h1 {
-    color: $tertiary;
-  }
-
-  .commits-list {
-    height: 149px;
-    overflow-y:auto;
-
-    li {
-      @extend .clearfix;
-      line-height: 1.0em;
-      padding: 6px 8px;
-    background-color: $primary-low;
-      .left {
-        float: left;
-      }
-      .right {
-        margin-left: 52px;
-      }
-
-      img {
-        margin-top: 2px;
-        border: solid 1px $primary-low;
-        padding: 2px;
-        background-color: $secondary;
-      }
-
-      .commit-message {
-        color: $primary;
-        font-size: 0.857em;
-        font-weight: bold;
-      }
-
-      .commit-meta {
-        color: $primary;
-        font-size: 0.857em;
-      }
-
-      .committer-name {
-        font-weight: bold;
-        color: $primary;
-      }
-    }
-    li:last-child {
-      border: none;
-    }
-  }
-
-  // Always show the scrollbar:
-  ::-webkit-scrollbar {
-    width: 6px;
-  }
-  ::-webkit-scrollbar-thumb {
-    background: $primary-low;
-    -webkit-border-radius: 3px;
-  }
-  ::-webkit-scrollbar-track {
-    border-left: solid 1px $primary-low;
-  }
-}
-
 .content-editor {
   min-height: 500px;