Fix flaky linux panel tests related to active state checks

chrome/browser/ui/panels/old_docked_panel_browsertest.cc

Index: chrome/browser/ui/panels/old_docked_panel_browsertest.cc
diff --git a/chrome/browser/ui/panels/old_docked_panel_browsertest.cc b/chrome/browser/ui/panels/old_docked_panel_browsertest.cc
index a70d0065cf8fd4491eaa6c27a672e5a370d6db3c..d7bea4a5a8838f2fe5e140eb9c980fc7f5c0f838 100644
--- a/chrome/browser/ui/panels/old_docked_panel_browsertest.cc
+++ b/chrome/browser/ui/panels/old_docked_panel_browsertest.cc
@@ -12,9 +12,6 @@
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/notification_service.h"
 
-// Panel tests are flaking on linux CQ. http://crbug.com/135377
-#if !defined(OS_LINUX)
-
 class OldDockedPanelBrowserTest : public OldBasePanelBrowserTest {
  public:
   virtual void SetUpOnMainThread() OVERRIDE {
@@ -282,5 +279,3 @@ IN_PROC_BROWSER_TEST_F(OldDockedPanelBrowserTest, CloseSqueezedPanels) {
 
   panel_manager->CloseAll();
 }
-
-#endif  // !OS_LINUX