Update chat remote.

Cleanup.

src/styles/global/theme/_dark.scss

@@ -22,16 +22,6 @@
 $theme-name: "Dark Theme";
 $theme-version: "0.0.1";
 
-@function branding-colors($base-lightness) {
-  @if($base-lightness == "light") {
-    @return "lighten";
-  }
-  @if($base-lightness == "dark") {
-    @return "darken";
-  }
-}
-
-$theme-lightness: branding-colors("dark");
 $theme-color: rgb(33, 33, 33);
 
 $contrasted-dark-default: rgb(38, 38, 38);  // compass
@@ -51,7 +41,7 @@ $buddylist-tab-background: $menu-background-color;
 $chat-background: darken($menu-background-color, 5%);
 $input-bg-color: lighten($menu-background-color, 20%);
 $chat-msg-self-background: lighten($chat-background, 10%);
-$chat-msg-remote-background: lighten($chat-msg-self-background, 10%);
+$chat-msg-remote-background: $chat-msg-self-background;
 $fileinfo-background: darken($chat-msg-self-background, 10%);
 $fileinfo-background-remote: darken($chat-msg-remote-background, 10%);
 $buddylist-action-background: transparent;