Remove the extra separator appears on the right side of the shelf

ash/common/system/tray/system_tray.cc

Index: ash/common/system/tray/system_tray.cc
diff --git a/ash/common/system/tray/system_tray.cc b/ash/common/system/tray/system_tray.cc
index 27609771d7d4feceac7ad6445c193a27aa089627..ceb1d198d9d865c5d7041b0cfdef1da4b6d621d9 100644
--- a/ash/common/system/tray/system_tray.cc
+++ b/ash/common/system/tray/system_tray.cc
@@ -221,6 +221,7 @@ SystemTray::SystemTray(WmShelf* wm_shelf)
   if (MaterialDesignController::IsShelfMaterial()) {
     SetInkDropMode(InkDropMode::ON);
     SetContentsBackground(false);
+    SetSeparatorVisibility(false);

[James Cook, 2017/01/09 23:50:53]

nit: add a comment saying why this doesn't need the separator (because it's
rightmost)

[yiyix, 2017/01/10 01:02:53]

similar to above, thank you.

   } else {
     SetContentsBackground(true);
   }