cros: Turn immersive fullscreen on by default

ash/ash_switches.h

Index: ash/ash_switches.h
diff --git a/ash/ash_switches.h b/ash/ash_switches.h
index 0c25875f314bf67e5f239014078c1cfb5e1be91f..57b5c6484b2bf7fb51e3dcdcc43bfca7eb447e93 100644
--- a/ash/ash_switches.h
+++ b/ash/ash_switches.h
@@ -27,6 +27,7 @@ ASH_EXPORT extern const char kAshDisableAutoMaximizing[];
 ASH_EXPORT extern const char kAshDisableAutoWindowPlacement[];
 ASH_EXPORT extern const char kAshDisableBootAnimation2[];
 ASH_EXPORT extern const char kAshDisableDisplayChangeLimiter[];
+ASH_EXPORT extern const char kAshDisableImmersiveFullscreen[];
 ASH_EXPORT extern const char kAshDisableLauncherPerDisplay[];
 ASH_EXPORT extern const char kAshDisableNewLockAnimations[];
 ASH_EXPORT extern const char kAshDisableNewNetworkStatusArea[];
@@ -38,11 +39,11 @@ ASH_EXPORT extern const char kAshEnableBrightnessControl[];
 #if defined(OS_LINUX)
 ASH_EXPORT extern const char kAshEnableMemoryMonitor[];
 #endif
+ASH_EXPORT extern const char kAshEnableImmersiveFullscreen[];
 ASH_EXPORT extern const char kAshEnableOak[];
 ASH_EXPORT extern const char kAshEnableTrayDragging[];
 ASH_EXPORT extern const char kAshEnableWorkspaceScrubbing[];
 ASH_EXPORT extern const char kAshHostWindowBounds[];
-ASH_EXPORT extern const char kAshImmersiveFullscreen[];
 ASH_EXPORT extern const char kAshImmersiveHideTabIndicators[];
 ASH_EXPORT extern const char kAshInternalDisplayUIScale[];
 ASH_EXPORT extern const char kAshSecondaryDisplayLayout[];