MD History: Convert synced device collapse icon to a button

chrome/browser/ui/webui/md_history_ui.cc

Index: chrome/browser/ui/webui/md_history_ui.cc
diff --git a/chrome/browser/ui/webui/md_history_ui.cc b/chrome/browser/ui/webui/md_history_ui.cc
index 3c24e8991b5afdf26be4c945b0ab4c98e88cac31..0894853e153c6adc2489adb45361c59e02210eeb 100644
--- a/chrome/browser/ui/webui/md_history_ui.cc
+++ b/chrome/browser/ui/webui/md_history_ui.cc
@@ -44,11 +44,15 @@ content::WebUIDataSource* CreateMdHistoryUIHTMLSource(Profile* profile) {
   source->AddLocalizedString("clearBrowsingData",
                              IDS_CLEAR_BROWSING_DATA_TITLE);
   source->AddLocalizedString("clearSearch", IDS_MD_HISTORY_CLEAR_SEARCH);
+  source->AddLocalizedString("collapseSessionButton",
+                             IDS_HISTORY_OTHER_SESSIONS_COLLAPSE_SESSION);
   source->AddLocalizedString("delete", IDS_MD_HISTORY_DELETE);
   source->AddLocalizedString("deleteConfirm",
                              IDS_HISTORY_DELETE_PRIOR_VISITS_CONFIRM_BUTTON);
   source->AddLocalizedString(
       "deleteWarning", IDS_HISTORY_DELETE_PRIOR_VISITS_WARNING_NO_INCOGNITO);
+  source->AddLocalizedString("expandSessionButton",
+                             IDS_HISTORY_OTHER_SESSIONS_EXPAND_SESSION);
   source->AddLocalizedString("foundSearchResults",
                              IDS_HISTORY_FOUND_SEARCH_RESULTS);
   source->AddLocalizedString("historyInterval", IDS_HISTORY_INTERVAL);