Instant: Use only one hidden WebContents per profile.

chrome/browser/history/history_tab_helper.cc

Index: chrome/browser/history/history_tab_helper.cc
diff --git a/chrome/browser/history/history_tab_helper.cc b/chrome/browser/history/history_tab_helper.cc
index 56b2dee05f75f9aae7aa63fdebe92ff92322bfc6..f9bf4f7bebcfe4324c460a0d297af442dc585e18 100644
--- a/chrome/browser/history/history_tab_helper.cc
+++ b/chrome/browser/history/history_tab_helper.cc
@@ -8,7 +8,6 @@
 
 #include "chrome/browser/history/history_service.h"
 #include "chrome/browser/history/history_service_factory.h"
-#include "chrome/browser/instant/instant_overlay.h"
 #include "chrome/browser/prerender/prerender_contents.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
@@ -127,13 +126,6 @@ void HistoryTabHelper::DidNavigateAnyFrame(
     }
   }
 
-  InstantOverlay* instant_overlay =
-      InstantOverlay::FromWebContents(web_contents());
-  if (instant_overlay) {
-    instant_overlay->DidNavigate(add_page_args);
-    return;
-  }
-
 #if !defined(OS_ANDROID)
   // Don't update history if this web contents isn't associatd with a tab.
   Browser* browser = chrome::FindBrowserWithWebContents(web_contents());