Change the way json_schema.js is loaded. This is required so

chrome/chrome.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
@@ skipping 2686 matching lines @@
         # Better is to remove the dep of *_tests on renderer, but in the
         # short term I'd like the build to work.
         'renderer/automation/dom_automation_controller.cc',
         'renderer/automation/dom_automation_controller.h',
         'renderer/extensions/bindings_utils.cc',
         'renderer/extensions/bindings_utils.h',
         'renderer/extensions/event_bindings.cc',
         'renderer/extensions/event_bindings.h',
         'renderer/extensions/extension_process_bindings.cc',
         'renderer/extensions/extension_process_bindings.h',
+        'renderer/extensions/js_only_v8_extensions.cc',
+        'renderer/extensions/js_only_v8_extensions.h',
         'renderer/extensions/renderer_extension_bindings.cc',
         'renderer/extensions/renderer_extension_bindings.h',
         'renderer/loadtimes_extension_bindings.h',
         'renderer/loadtimes_extension_bindings.cc',
         'renderer/media/audio_renderer_impl.cc',
         'renderer/media/audio_renderer_impl.h',
         'renderer/net/render_dns_master.cc',
         'renderer/net/render_dns_master.h',
         'renderer/net/render_dns_queue.cc',
         'renderer/net/render_dns_queue.h',
@@ skipping 12 matching lines @@
         'renderer/devtools_agent_filter.h',
         'renderer/devtools_client.cc',
         'renderer/devtools_client.h',
         'renderer/dom_ui_bindings.cc',
         'renderer/dom_ui_bindings.h',
         'renderer/extension_groups.h',
         'renderer/external_host_bindings.cc',
         'renderer/external_host_bindings.h',
         'renderer/external_extension.cc',
         'renderer/external_extension.h',
-        'renderer/js_only_v8_extensions.cc',
-        'renderer/js_only_v8_extensions.h',
         'renderer/localized_error.cc',
         'renderer/localized_error.h',
         'renderer/navigation_state.h',
         'renderer/plugin_channel_host.cc',
         'renderer/plugin_channel_host.h',
         'renderer/print_web_view_helper.cc',
         'renderer/print_web_view_helper.h',
         'renderer/print_web_view_helper_linux.cc',
         'renderer/print_web_view_helper_mac.cc',
         'renderer/print_web_view_helper_win.cc',
@@ skipping 2954 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }