Instant: Use only one hidden WebContents per profile.

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 923 matching lines @@
         'browser/infobars/infobar.h',
         'browser/infobars/infobar_container.cc',
         'browser/infobars/infobar_container.h',
         'browser/infobars/infobar_tab_helper.cc',
         'browser/infobars/infobar_tab_helper.h',
         'browser/infobars/insecure_content_infobar_delegate.cc',
         'browser/infobars/insecure_content_infobar_delegate.h',
         'browser/instant/instant_commit_type.h',
         'browser/instant/instant_controller.cc',
         'browser/instant/instant_controller.h',
+        'browser/instant/instant_controller_extended_impl.cc',
+        'browser/instant/instant_controller_extended_impl.h',
+        'browser/instant/instant_controller_impl.cc',
+        'browser/instant/instant_controller_impl.h',
+        'browser/instant/instant_controller_utils.cc',
+        'browser/instant/instant_controller_utils.h',
         'browser/instant/instant_loader.cc',
         'browser/instant/instant_loader.h',
         'browser/instant/instant_model.cc',
         'browser/instant/instant_model.h',
         'browser/instant/instant_model_observer.h',
-        'browser/instant/instant_ntp.cc',
-        'browser/instant/instant_ntp.h',
         'browser/instant/instant_overlay.cc',
         'browser/instant/instant_overlay.h',
+        'browser/instant/instant_overlay_controller.cc',
+        'browser/instant/instant_overlay_controller.h',
         'browser/instant/instant_page.h',
         'browser/instant/instant_page.cc',
-        'browser/instant/instant_preview_controller.cc',
-        'browser/instant/instant_preview_controller.h',
         'browser/instant/instant_service.cc',
         'browser/instant/instant_service.h',
         'browser/instant/instant_service_factory.cc',
         'browser/instant/instant_service_factory.h',
-        'browser/instant/instant_tab.cc',
-        'browser/instant/instant_tab.h',
+        'browser/instant/instant_service_observer.h',
         'browser/instant/instant_unload_handler.cc',
         'browser/instant/instant_unload_handler.h',
+        'browser/instant/instant_web_contents_container.cc',
+        'browser/instant/instant_web_contents_container.h',
         'browser/internal_auth.cc',
         'browser/internal_auth.h',
         'browser/intranet_redirect_detector.cc',
         'browser/intranet_redirect_detector.h',
         'browser/io_thread.cc',
         'browser/io_thread.h',
         'browser/jankometer.cc',
         'browser/jankometer.h',
         'browser/jankometer_android.cc',
         'browser/jankometer_mac.cc',
@@ skipping 2167 matching lines @@
           'variables': {
             'jni_gen_dir': 'chrome',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
       ],
      },
     ],
   ],
 }