Remove TopSites::IsEnabled() as well as related dead code.

chrome/browser/history/history.cc

Index: chrome/browser/history/history.cc
diff --git a/chrome/browser/history/history.cc b/chrome/browser/history/history.cc
index 0736fc2f97ae713591d93dfe3d12125187e47e07..09434e164dd94f3eb654d39c143b8fee29e2179f 100644
--- a/chrome/browser/history/history.cc
+++ b/chrome/browser/history/history.cc
@@ -791,7 +791,7 @@ void HistoryService::OnDBLoaded() {
   NotificationService::current()->Notify(NotificationType::HISTORY_LOADED,
                                          Source<Profile>(profile_),
                                          Details<HistoryService>(this));
-  if (thread_ && profile_ && history::TopSites::IsEnabled()) {
+  if (thread_ && profile_) {
     // We don't want to force creation of TopSites.
     history::TopSites* ts = profile_->GetTopSitesWithoutCreating();
     if (ts)
@@ -801,7 +801,7 @@ void HistoryService::OnDBLoaded() {
 
 void HistoryService::StartTopSitesMigration() {
   needs_top_sites_migration_ = true;
-  if (thread_ && profile_ && history::TopSites::IsEnabled()) {
+  if (thread_ && profile_) {
     // We don't want to force creation of TopSites.
     history::TopSites* ts = profile_->GetTopSitesWithoutCreating();
     if (ts)