Remove WebContents::Was{Hidden,Shown}() from the content public interface

chrome/browser/sessions/tab_loader.cc

Index: chrome/browser/sessions/tab_loader.cc
diff --git a/chrome/browser/sessions/tab_loader.cc b/chrome/browser/sessions/tab_loader.cc
index 676db802f58f34533763271946b0b924b2d9d58c..1fe6869cf436861884d3623b50648eecce9dd60a 100644
--- a/chrome/browser/sessions/tab_loader.cc
+++ b/chrome/browser/sessions/tab_loader.cc
@@ -183,7 +183,10 @@ void TabLoader::LoadNextTab() {
         // NOTE: We need to do this here rather than when the tab is added to
         // the Browser as at that time not everything has been created, so that
         // the call would do nothing.
-        contents->WasHidden();
+        //
+        // TODO(tapted): See whether |initially_hidden| can instead be used when
+        // creating the WebContents.
+        contents->MarkBackgrounded();
       }
     }
   }