Return webcontents and add in test.

chrome/browser/sessions/persistent_tab_restore_service.cc

Index: chrome/browser/sessions/persistent_tab_restore_service.cc
diff --git a/chrome/browser/sessions/persistent_tab_restore_service.cc b/chrome/browser/sessions/persistent_tab_restore_service.cc
index d02f25ad807e0341d51aa0445374c5504bfa828d..0aa9c3c03bad8809137a64184b657e1d584ecd9f 100644
--- a/chrome/browser/sessions/persistent_tab_restore_service.cc
+++ b/chrome/browser/sessions/persistent_tab_restore_service.cc
@@ -942,10 +942,11 @@ const TabRestoreService::Entries& PersistentTabRestoreService::entries() const {
   return helper_.entries();
 }
 
-void PersistentTabRestoreService::RestoreMostRecentEntry(
+std::vector<content::WebContents*>
+PersistentTabRestoreService::RestoreMostRecentEntry(
     TabRestoreServiceDelegate* delegate,
     chrome::HostDesktopType host_desktop_type) {
-  helper_.RestoreMostRecentEntry(delegate, host_desktop_type);
+  return helper_.RestoreMostRecentEntry(delegate, host_desktop_type);
 }
 
 TabRestoreService::Tab* PersistentTabRestoreService::RemoveTabEntryById(
@@ -953,12 +954,13 @@ TabRestoreService::Tab* PersistentTabRestoreService::RemoveTabEntryById(
   return helper_.RemoveTabEntryById(id);
 }
 
-void PersistentTabRestoreService::RestoreEntryById(
-    TabRestoreServiceDelegate* delegate,
-    SessionID::id_type id,
-    chrome::HostDesktopType host_desktop_type,
-    WindowOpenDisposition disposition) {
-  helper_.RestoreEntryById(delegate, id, host_desktop_type, disposition);
+std::vector<content::WebContents*>
+    PersistentTabRestoreService::RestoreEntryById(
+      TabRestoreServiceDelegate* delegate,
+      SessionID::id_type id,
+      chrome::HostDesktopType host_desktop_type,
+      WindowOpenDisposition disposition) {
+  return helper_.RestoreEntryById(delegate, id, host_desktop_type, disposition);
 }
 
 bool PersistentTabRestoreService::IsLoaded() const {