Componentize enhanced_bookmark_features.{h,cc}.

components/enhanced_bookmarks/enhanced_bookmark_switches.cc

Index: components/enhanced_bookmarks/enhanced_bookmark_switches.cc
diff --git a/components/web_resource/web_resource_switches.cc b/components/enhanced_bookmarks/enhanced_bookmark_switches.cc
similarity index 54%
copy from components/web_resource/web_resource_switches.cc
copy to components/enhanced_bookmarks/enhanced_bookmark_switches.cc
index 8a1f9a772c0997b747f3dadfd6ffdcac8bbc2cff..30f183bee37fa16c57797d6ee9fb053acf944108 100644
--- a/components/web_resource/web_resource_switches.cc
+++ b/components/enhanced_bookmarks/enhanced_bookmark_switches.cc
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/web_resource/web_resource_switches.h"
+#include "components/enhanced_bookmarks/enhanced_bookmark_switches.h"
 
 namespace switches {
 
-// Specifies a custom URL for fetching NTP promo data.
-const char kPromoServerURL[] = "promo-server-url";
+// Enable Enhanced Bookmarks.
+const char kEnhancedBookmarksExperiment[] = "enhanced-bookmarks-experiment";
 
 }  // namespace switches