Make DisplayInfoProvider an interface

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 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.
 
 {
   'variables': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/diagnostics/diagnostics_api.cc',
       'browser/extensions/api/diagnostics/diagnostics_api.h',
       'browser/extensions/api/diagnostics/diagnostics_api_chromeos.cc',
@@ skipping 496 matching lines @@
       'browser/extensions/api/synced_notifications_private/synced_notifications_shim.h',
       'browser/extensions/api/system_cpu/cpu_info_provider.cc',
       'browser/extensions/api/system_cpu/cpu_info_provider.h',
       'browser/extensions/api/system_cpu/cpu_info_provider_linux.cc',
       'browser/extensions/api/system_cpu/cpu_info_provider_mac.cc',
       'browser/extensions/api/system_cpu/cpu_info_provider_win.cc',
       'browser/extensions/api/system_cpu/system_cpu_api.cc',
       'browser/extensions/api/system_cpu/system_cpu_api.h',
       'browser/extensions/api/system_display/display_info_provider.cc',
       'browser/extensions/api/system_display/display_info_provider.h',
-      'browser/extensions/api/system_display/display_info_provider_chromeos.cc',
-      'browser/extensions/api/system_display/display_info_provider_mac.cc',
-      'browser/extensions/api/system_display/display_info_provider_win.cc',
       'browser/extensions/api/system_display/system_display_api.cc',
       'browser/extensions/api/system_display/system_display_api.h',
       'browser/extensions/api/system_indicator/system_indicator_api.h',
       'browser/extensions/api/system_indicator/system_indicator_manager.cc',
       'browser/extensions/api/system_indicator/system_indicator_manager.h',
       'browser/extensions/api/system_indicator/system_indicator_manager_factory.cc',
       'browser/extensions/api/system_indicator/system_indicator_manager_factory.h',
       'browser/extensions/api/system_info/system_info_api.cc',
       'browser/extensions/api/system_info/system_info_api.h',
       'browser/extensions/api/system_info/system_info_provider.cc',
@@ skipping 113 matching lines @@
       'browser/extensions/crx_installer.h',
       'browser/extensions/crx_installer_error.h',
       'browser/extensions/data_deleter.cc',
       'browser/extensions/data_deleter.h',
       'browser/extensions/declarative_user_script_master.cc',
       'browser/extensions/declarative_user_script_master.h',
       'browser/extensions/dev_mode_bubble_controller.cc',
       'browser/extensions/dev_mode_bubble_controller.h',
       'browser/extensions/devtools_util.cc',
       'browser/extensions/devtools_util.h',
+      'browser/extensions/display_info_provider_chromeos.cc',
+      'browser/extensions/display_info_provider_chromeos.h',
+      'browser/extensions/display_info_provider_mac.cc',
+      'browser/extensions/display_info_provider_mac.h',
+      'browser/extensions/display_info_provider_win.cc',
+      'browser/extensions/display_info_provider_win.h',
       'browser/extensions/error_console/error_console.cc',
       'browser/extensions/error_console/error_console.h',
       'browser/extensions/event_router_forwarder.cc',
       'browser/extensions/event_router_forwarder.h',
       'browser/extensions/extension_action.cc',
       'browser/extensions/extension_action.h',
       'browser/extensions/extension_action_icon_factory.cc',
       'browser/extensions/extension_action_icon_factory.h',
       'browser/extensions/extension_action_manager.cc',
       'browser/extensions/extension_action_manager.h',
@@ skipping 465 matching lines @@
               'dependencies': [
                 '../dbus/dbus.gyp:dbus',
                 '../third_party/protobuf/protobuf.gyp:protobuf_lite',
                 '../third_party/protobuf/protobuf.gyp:protoc#host',
               ],
             }],
           ],
         }],
         ['OS!="win" and chromeos==0', {
           'sources': [
-            'browser/extensions/api/system_display/display_info_provider_aura.cc',
+            'browser/extensions/display_info_provider_aura.cc',
+            'browser/extensions/display_info_provider_aura.h',
           ],
         }],
         ['enable_app_list==1', {
           'sources': [
             '<@(chrome_browser_extensions_app_list_sources)',
           ],
         }],
         ['enable_webrtc==1', {
           'sources': [
             'browser/extensions/api/webrtc_logging_private/webrtc_logging_private_api.cc',
@@ skipping 15 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }