Use TabLoader in TabRestoreService.

components/sessions/content/content_live_tab.cc

Index: components/sessions/content/content_live_tab.cc
diff --git a/components/sessions/content/content_live_tab.cc b/components/sessions/content/content_live_tab.cc
index 7b1dff013eec0e035152e42481f4112a835542bc..3f1ef66e042586fa629f3fa860ebb605825cc439 100644
--- a/components/sessions/content/content_live_tab.cc
+++ b/components/sessions/content/content_live_tab.cc
@@ -62,10 +62,6 @@ ContentLiveTab::GetPlatformSpecificTabData() {
       web_contents());
 }
 
-void ContentLiveTab::LoadIfNecessary() {
-  navigation_controller().LoadIfNecessary();
-}
-
 const std::string& ContentLiveTab::GetUserAgentOverride() const {
   return web_contents()->GetUserAgentOverride();
 }