cros: Turn immersive fullscreen on by default

chrome/browser/ui/views/frame/immersive_mode_controller_ash_browsertest.cc

 // Copyright 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 "chrome/browser/ui/views/frame/immersive_mode_controller_ash.h"
 
 #include "ash/ash_switches.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_types.h"
@@ skipping 40 matching lines @@
 
   // Callback for when the onbeforeunload dialog closes for the sake of testing
   // the dialog with immersive mode.
   void OnBeforeUnloadJavaScriptDialogClosed(
       bool success,
       const string16& user_input) {
   }
 
   // content::BrowserTestBase overrides:
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
-    command_line->AppendSwitch(ash::switches::kAshImmersiveFullscreen);
+    chrome::EnableImmersiveFullscreenForTest();
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ImmersiveModeControllerAshTest);
 };
 
 IN_PROC_BROWSER_TEST_F(ImmersiveModeControllerAshTest, ImmersiveMode) {
   ui::ScopedAnimationDurationScaleMode zero_duration_mode(
       ui::ScopedAnimationDurationScaleMode::ZERO_DURATION);
   ASSERT_TRUE(chrome::UseImmersiveFullscreen());
@@ skipping 481 matching lines @@
 
   // Setting the window property directly toggles immersive mode.
   aura::Window* window = browser_view->GetWidget()->GetNativeWindow();
   window->SetProperty(ash::internal::kImmersiveModeKey, true);
   EXPECT_TRUE(immersive_controller->IsEnabled());
   window->SetProperty(ash::internal::kImmersiveModeKey, false);
   EXPECT_FALSE(immersive_controller->IsEnabled());
 }
 
 #endif  // defined(OS_CHROMEOS)