Panels refactor: Support browserless panels on Linux.

chrome/browser/ui/panels/docked_panel_browsertest.cc

Index: chrome/browser/ui/panels/docked_panel_browsertest.cc
diff --git a/chrome/browser/ui/panels/docked_panel_browsertest.cc b/chrome/browser/ui/panels/docked_panel_browsertest.cc
index e16cd9a8bbef5054a89bb5e28bd7f95eb6e0d19a..f5baac513364e30500d00e9c33950da14cffe3bc 100644
--- a/chrome/browser/ui/panels/docked_panel_browsertest.cc
+++ b/chrome/browser/ui/panels/docked_panel_browsertest.cc
@@ -11,9 +11,6 @@
 #include "content/public/browser/notification_service.h"
 #include "content/public/test/test_utils.h"
 
-// Refactor has only been done for Win and Mac panels so far.
-#if defined(OS_WIN) || defined(OS_MACOSX)
-
 class DockedPanelBrowserTest : public BasePanelBrowserTest {
  public:
   virtual void SetUpOnMainThread() OVERRIDE {
@@ -268,5 +265,3 @@ IN_PROC_BROWSER_TEST_F(DockedPanelBrowserTest, CloseSqueezedPanels) {
 
   panel_manager->CloseAll();
 }
-
-#endif // OS_WIN || OS_MACOSX