Panels refactor: Support browserless panels on Linux.

chrome/browser/ui/panels/panel_browsertest.cc

Index: chrome/browser/ui/panels/panel_browsertest.cc
diff --git a/chrome/browser/ui/panels/panel_browsertest.cc b/chrome/browser/ui/panels/panel_browsertest.cc
index 13b677ddc93afa3dd7329cf1bf01ff4340b9cc76..abfca0a79ae9baf0504d34cd036af40feda97d15 100644
--- a/chrome/browser/ui/panels/panel_browsertest.cc
+++ b/chrome/browser/ui/panels/panel_browsertest.cc
@@ -42,9 +42,6 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/screen.h"
 
-// Refactor has only been done for Win and Mac panels so far.
-#if defined(OS_WIN) || defined(OS_MACOSX)
-
 using content::BrowserContext;
 using content::BrowserThread;
 using content::DownloadItem;
@@ -1300,9 +1297,9 @@ IN_PROC_BROWSER_TEST_F(PanelBrowserTest, FocusLostOnMinimize) {
   Panel* panel = CreatePanelWithParams(params);
   EXPECT_EQ(Panel::EXPANDED, panel->expansion_state());
 
-  panel->SetExpansionState(Panel::MINIMIZED);
-  MessageLoop::current()->RunAllPending();
-  WaitForPanelActiveState(panel, SHOW_AS_INACTIVE);
+  PanelActiveStateObserver signal(panel, false);
+  panel->Minimize();
+  signal.Wait();
   panel->Close();
 }
 
@@ -1577,5 +1574,3 @@ IN_PROC_BROWSER_TEST_F(PanelBrowserTest,
 
   panel->Close();
 }
-
-#endif // OS_WIN || OS_MACOSX