Chrome OS should open to empty desktop when session restore is empty.

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 "base/command_line.h"
 #include "base/file_path.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 33 matching lines @@
     // TODO(bauerb): set the first run flag instead of creating a sentinel file.
     first_run::CreateSentinel();
     return ExtensionBrowserTest::SetUpUserDataDirectory();
   }
 
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     ExtensionBrowserTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kEnablePanels);
     command_line->AppendSwitchASCII(switches::kHomePage,
                                     chrome::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.
   void LoadApp(const std::string& app_name,
                const Extension** out_app_extension) {
     ASSERT_TRUE(LoadExtension(test_data_dir_.AppendASCII(app_name.c_str())));
 
     ExtensionService* service = browser()->profile()->GetExtensionService();
@@ skipping 599 matching lines @@
   ASSERT_EQ(1u, browser::GetBrowserCount(profile_urls));
   new_browser = FindOneOtherBrowserForProfile(profile_urls, NULL);
   ASSERT_TRUE(new_browser);
   ASSERT_EQ(1, new_browser->tab_count());
   EXPECT_EQ(GURL(chrome::kChromeUINewTabURL),
             chrome::GetWebContentsAt(new_browser, 0)->GetURL());
   EXPECT_EQ(1U, chrome::GetTabContentsAt(new_browser, 0)->infobar_tab_helper()->
             GetInfoBarCount());
 }
 #endif  // !OS_CHROMEOS