Start removing deprecated Options UI code

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index d6efa4161d1cf9271d99d0412898486a9b78c802..720dca54fbdea42a4dd4d60af5655ede35cee6b8 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -208,11 +208,6 @@ const base::Feature kMaterialDesignIncognitoNTP{
 #endif
 };
 
-// Enables or disables the Material Design version of chrome://settings.
-// Also affects chrome://help.
-const base::Feature kMaterialDesignSettings{"MaterialDesignSettings",
-                                            base::FEATURE_ENABLED_BY_DEFAULT};
-
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 // Enables media content bitstream remoting, an optimization that can activate
 // during Cast Tab Mirroring.