Remove old webui History page on desktop and mobile

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 53bcd053fdb91d400aa8916b326f188d582bdf48..ceb4644a3e1ef83ecf109c84485e9e28de2de96a 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -495,9 +495,6 @@ const char kForceLocalNtp[]                 = "force-local-ntp";
 // prefixed with the character "t" will be treated as Trigger Variation Ids.
 const char kForceVariationIds[]             = "force-variation-ids";
 
-// Enables grouping websites by domain and filtering them by period.
-const char kHistoryEnableGroupByDomain[]    = "enable-grouped-history";
-
 // Specifies which page will be displayed in newly-opened tabs. We need this
 // for testing purposes so that the UI tests don't depend on what comes up for
 // http://google.com.