Use process per site instance for "Instant".

chrome/browser/ui/search/instant_ntp_prerenderer.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_SEARCH_INSTANT_NTP_PRERENDERER_H_
 #define CHROME_BROWSER_UI_SEARCH_INSTANT_NTP_PRERENDERER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 90 matching lines @@
                            SwitchesToLocalNTPIfNoNTPReady);
   FRIEND_TEST_ALL_PREFIXES(InstantNTPPrerendererTest,
                            IsJavascriptEnabled);
   FRIEND_TEST_ALL_PREFIXES(InstantNTPPrerendererTest,
                            IsJavascriptEnabledChecksContentSettings);
   FRIEND_TEST_ALL_PREFIXES(InstantNTPPrerendererTest,
                            IsJavascriptEnabledChecksPrefs);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedManualTest, MANUAL_ShowsGoogleNTP);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedManualTest,
                            MANUAL_SearchesFromFakebox);
+  FRIEND_TEST_ALL_PREFIXES(InstantExtendedTest, ProcessIsolation);
 
   // Overridden from net::NetworkChangeNotifier::NetworkChangeObserver:
   // If the network status changes, resets InstantNTP.
   virtual void OnNetworkChanged(net::NetworkChangeNotifier::ConnectionType type)
       OVERRIDE;
 
   // Overridden from InstantPage::Delegate:
   virtual void InstantSupportDetermined(const content::WebContents* contents,
                                         bool supports_instant) OVERRIDE;
   virtual void InstantPageAboutToNavigateMainFrame(
@@ skipping 35 matching lines @@
 
   // Preloaded InstantNTP.
   scoped_ptr<InstantNTP> ntp_;
 
   PrefChangeRegistrar profile_pref_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantNTPPrerenderer);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_INSTANT_NTP_PRERENDERER_H_