Make TabContents ctor private; poke hole for existing callers.

chrome/browser/ui/tab_contents/tab_contents.cc

Index: chrome/browser/ui/tab_contents/tab_contents.cc
diff --git a/chrome/browser/ui/tab_contents/tab_contents.cc b/chrome/browser/ui/tab_contents/tab_contents.cc
index b905d5f7d379091303603c63feb69cf23e55eb90..09b4965f8bbee159737173557ea9faacb48d7be0 100644
--- a/chrome/browser/ui/tab_contents/tab_contents.cc
+++ b/chrome/browser/ui/tab_contents/tab_contents.cc
@@ -82,6 +82,16 @@ class TabContentsUserData : public base::SupportsUserData::Data {
 ////////////////////////////////////////////////////////////////////////////////
 // TabContents, public:
 
+// static
+TabContents* TabContents::Factory::CreateTabContents(WebContents* contents) {
+  return new TabContents(contents);
+}
+
+// static
+TabContents* TabContents::Factory::CloneTabContents(TabContents* contents) {
+  return contents->Clone();
+}
+
 TabContents::TabContents(WebContents* contents)
     : content::WebContentsObserver(contents),
       in_destructor_(false),