Fix flaky linux panel tests related to active state checks

chrome/browser/ui/panels/old_panel_drag_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop.h"
 #include "chrome/browser/ui/panels/old_base_panel_browser_test.h"
 #include "chrome/browser/ui/panels/detached_panel_strip.h"
 #include "chrome/browser/ui/panels/docked_panel_strip.h"
 #include "chrome/browser/ui/panels/native_panel.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_drag_controller.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
 #include "chrome/browser/ui/panels/test_panel_mouse_watcher.h"
 
-// Panel tests are flaking on linux CQ. http://crbug.com/135377
-#if !defined(OS_LINUX)
-
 class OldPanelDragBrowserTest : public OldBasePanelBrowserTest {
  public:
   OldPanelDragBrowserTest() : OldBasePanelBrowserTest() {
   }
 
   virtual ~OldPanelDragBrowserTest() {
   }
 
   virtual void SetUpOnMainThread() OVERRIDE {
     OldBasePanelBrowserTest::SetUpOnMainThread();
@@ skipping 1315 matching lines @@
 
   // Drag down the panel. Expect that the panel can be dragged without
   // constraint.
   drag_to_location = gfx::Point(280, 150);
   DragPanelToMouseLocation(panel, drag_to_location);
   EXPECT_EQ(PanelStrip::DETACHED, panel->panel_strip()->type());
   EXPECT_EQ(drag_to_location, panel->GetBounds().origin());
 
   panel_manager->CloseAll();
 }
-
-#endif  // !OS_LINUX