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

ash/common/system/chromeos/session/logout_button_tray.cc

Index: ash/common/system/chromeos/session/logout_button_tray.cc
diff --git a/ash/common/system/chromeos/session/logout_button_tray.cc b/ash/common/system/chromeos/session/logout_button_tray.cc
index e3cfc2e3b20c7e86c9077f7856605d5567cce2d9..319e2ee7574463be802182e06a75273022fd375f 100644
--- a/ash/common/system/chromeos/session/logout_button_tray.cc
+++ b/ash/common/system/chromeos/session/logout_button_tray.cc
@@ -116,6 +116,7 @@ LogoutButtonTray::LogoutButtonTray(WmShelf* wm_shelf)
     // crbug.com/623987
     button->AdjustFontSize(2);
     button_ = button;
+    SetSeparatorVisibility(false);

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

nit: comment why this is false (because logout button has a strong visual right
edge so doesn't need it?)

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

You are right, after removing the entire logics on whether to show a separator,
some comments would help the readers to understand the new logic.

   } else {
     button_ = new LogoutButton(this);
   }