Instant: Use only one hidden WebContents per profile.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index e08450bdb74001dc757a649df102598529207dfa..9024b74ce9d6ffdd154823701fdaef28db801907 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -1130,8 +1130,11 @@ void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
       InstantService* instant_service =
           InstantServiceFactory::GetForProfile(profile);
       if (instant_service &&
-          instant_service->IsInstantProcess(process->GetID()))
+          instant_service->IsInstantProcess(process->GetID())) {
         command_line->AppendSwitch(switches::kInstantProcess);
+        if (chrome::search::IsInstantExtendedAPIEnabled())
+          command_line->AppendSwitch(switches::kEnableInstantExtendedAPI);
+      }
 
       SigninManager* signin_manager =
           SigninManagerFactory::GetForProfile(profile);