Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/startup/startup_browser_creator_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 <stddef.h>
 
 #include <algorithm>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 106 matching lines @@
 class StartupBrowserCreatorTest : public ExtensionBrowserTest {
  protected:
   StartupBrowserCreatorTest() {}
 
   bool SetUpUserDataDirectory() override {
     return ExtensionBrowserTest::SetUpUserDataDirectory();
   }
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionBrowserTest::SetUpCommandLine(command_line);
-    command_line->AppendSwitch(switches::kEnablePanels);
     command_line->AppendSwitchASCII(switches::kHomePage, url::kAboutBlankURL);
 #if defined(OS_CHROMEOS)
     // TODO(nkostylev): Investigate if we can remove this switch.
     command_line->AppendSwitch(switches::kCreateBrowserOnStartupForTests);
 #endif
   }
 
   // Helper functions return void so that we can ASSERT*().
   // Use ASSERT_NO_FATAL_FAILURE around calls to these functions to stop the
   // test if an assert fails.
@@ skipping 1480 matching lines @@
   ASSERT_TRUE(new_browser);
 
   // Verify that the first-run tab is shown and no other pages are present.
   TabStripModel* tab_strip = new_browser->tab_strip_model();
   ASSERT_EQ(1, tab_strip->count());
   EXPECT_EQ("title1.html",
             tab_strip->GetWebContentsAt(0)->GetURL().ExtractFileName());
 }
 
 #endif  // !defined(OS_CHROMEOS)