Move immersive fullscreen check into ImmersiveFullscreenConfiguration.

chrome/browser/ui/immersive_fullscreen_configuration.h

Index: chrome/browser/ui/immersive_fullscreen_configuration.h
diff --git a/chrome/browser/ui/immersive_fullscreen_configuration.h b/chrome/browser/ui/immersive_fullscreen_configuration.h
index 5257f17e625262752362463e78cb555ff369d5e0..df6ce3aa43acf8134072d4081240d557e7864eba 100644
--- a/chrome/browser/ui/immersive_fullscreen_configuration.h
+++ b/chrome/browser/ui/immersive_fullscreen_configuration.h
@@ -9,6 +9,10 @@
 
 class ImmersiveFullscreenConfiguration {
  public:
+  // Returns true if immersive mode should be used for fullscreen based on
+  // command line flags.
+  static bool UseImmersiveFullscreen();
+
   static int immersive_mode_reveal_delay_ms() {
     return immersive_mode_reveal_delay_ms_;
   }