Fix flaky linux panel tests related to active state checks

chrome/browser/ui/panels/old_panel_and_desktop_notification_browsertest.cc

Index: chrome/browser/ui/panels/old_panel_and_desktop_notification_browsertest.cc
diff --git a/chrome/browser/ui/panels/old_panel_and_desktop_notification_browsertest.cc b/chrome/browser/ui/panels/old_panel_and_desktop_notification_browsertest.cc
index f6707a09ad804e2632c5f08b820e194c8138ed3b..5545a5bc74911add3d0625b1551882a62e28304e 100644
--- a/chrome/browser/ui/panels/old_panel_and_desktop_notification_browsertest.cc
+++ b/chrome/browser/ui/panels/old_panel_and_desktop_notification_browsertest.cc
@@ -19,9 +19,6 @@
 #include "content/public/common/show_desktop_notification_params.h"
 #include "ui/gfx/screen.h"
 
-// Panel tests are flaking on linux CQ. http://crbug.com/135377
-#if !defined(OS_LINUX)
-
 // Desktop notification code subscribes to various panel change notifications
 // so that it knows when to adjusts balloon positions. In order to give
 // desktop notification code a chance to process the change notifications,
@@ -425,5 +422,3 @@ IN_PROC_BROWSER_TEST_F(OldPanelAndDesktopNotificationTest,
   MessageLoopForUI::current()->RunAllPending();
   EXPECT_EQ(original_balloon_bottom, GetBalloonBottomPosition(balloon));
 }
-
-#endif  // !OS_LINUX