Convert resources to take an instance key instead of an Instance*.

ppapi/ppapi_sources.gypi

 # Copyright (c) 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.
 
 {
   'variables': {
     'c_source_files': [
       'c/pp_bool.h',
       'c/pp_completion_callback.h',
       'c/pp_errors.h',
@@ skipping 133 matching lines @@
       'cpp/graphics_3d.cc',
       'cpp/graphics_3d.h',
       'cpp/graphics_3d_client.cc',
       'cpp/graphics_3d_client.h',
       'cpp/image_data.cc',
       'cpp/image_data.h',
       'cpp/input_event.cc',
       'cpp/input_event.h',
       'cpp/instance.cc',
       'cpp/instance.h',
+      'cpp/instance_handle.cc',
+      'cpp/instance_handle.h',
       'cpp/logging.h',
       'cpp/module.cc',
       'cpp/module.h',
       'cpp/module_impl.h',
       'cpp/mouse_lock.cc',
       'cpp/mouse_lock.h',
       'cpp/point.h',
       'cpp/rect.cc',
       'cpp/rect.h',
       'cpp/resource.cc',
@@ skipping 267 matching lines @@
           'c/dev/ppb_transport_dev.h',
         ],
         'cpp_source_files': [
           'cpp/dev/transport_dev.cc',
           'cpp/dev/transport_dev.h',
         ],
       },
     }],
   ],
 }