Use process per site instance for "Instant".

chrome/browser/search/instant_service.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_SEARCH_INSTANT_SERVICE_H_
 #define CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 94 matching lines @@
  private:
   friend class InstantExtendedTest;
   friend class InstantTestBase;
 
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedNetworkTest,
                            NTPReactsToNetworkChanges);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedManualTest,
                            MANUAL_ShowsGoogleNTP);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedManualTest,
                            MANUAL_SearchesFromFakebox);
+  FRIEND_TEST_ALL_PREFIXES(InstantExtendedTest, ProcessIsolation);
 
   // Overridden from BrowserContextKeyedService:
   virtual void Shutdown() OVERRIDE;
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Called when we get new most visited items from TopSites, registered as an
@@ skipping 33 matching lines @@
   // created for OTR browser windows). Used to preload and delete InstantNTP.
   size_t browser_instant_controller_object_count_;
 
   // Used for Top Sites async retrieval.
   base::WeakPtrFactory<InstantService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantService);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_