Clean up IconNTP-related code

ui/base/ui_base_switches.cc

Index: ui/base/ui_base_switches.cc
diff --git a/ui/base/ui_base_switches.cc b/ui/base/ui_base_switches.cc
index 2544b1a5f8eb94899573821d06e1f23d5360ba29..ae808387aa65d27a0b6af6c9db3dd2ac6c152b80 100644
--- a/ui/base/ui_base_switches.cc
+++ b/ui/base/ui_base_switches.cc
@@ -34,18 +34,12 @@ const char kEnableMergeKeyCharEvents[]     = "enable-merge-key-char-events";
 // Disables use of DWM composition for top level windows.
 const char kDisableDwmComposition[] = "disable-dwm-composition";
 
-// Disables large icons on the New Tab page.
-const char kDisableIconNtp[] = "disable-icon-ntp";
-
 // Disables touch adjustment.
 const char kDisableTouchAdjustment[] = "disable-touch-adjustment";
 
 // Disables touch event based drag and drop.
 const char kDisableTouchDragDrop[] = "disable-touch-drag-drop";
 
-// Enables large icons on the New Tab page.
-const char kEnableIconNtp[] = "enable-icon-ntp";
-
 // Enables touch event based drag and drop.
 const char kEnableTouchDragDrop[] = "enable-touch-drag-drop";