Move V4L2 code into a webcam helper class.

extensions/extensions.gypi

Index: extensions/extensions.gypi
diff --git a/extensions/extensions.gypi b/extensions/extensions.gypi
index 7dab3b0174e1ba2bd2de7f9cf7ad2ef49fab4529..c0bc22c1f8090374d62473a69b8bee3f27fc8c20 100644
--- a/extensions/extensions.gypi
+++ b/extensions/extensions.gypi
@@ -502,8 +502,6 @@
       'browser/api/web_request/web_request_permissions.h',
       'browser/api/web_request/web_request_time_tracker.cc',
       'browser/api/web_request/web_request_time_tracker.h',
-      'browser/api/webcam_private/webcam_private_api.h',
-      'browser/api/webcam_private/webcam_private_api_chromeos.cc',
       'browser/api_activity_monitor.h',
       'browser/app_sorting.h',
       'browser/app_window/app_delegate.h',
@@ -799,6 +797,12 @@
       'browser/api/vpn_provider/vpn_service.cc',
       'browser/api/vpn_provider/vpn_service.h',
       'browser/api/vpn_provider/vpn_service_factory.h',
+      'browser/api/webcam_private/v4l2_webcam.h',
+      'browser/api/webcam_private/v4l2_webcam.cc',
+      'browser/api/webcam_private/webcam.h',
+      'browser/api/webcam_private/webcam.cc',
+      'browser/api/webcam_private/webcam_private_api.h',
+      'browser/api/webcam_private/webcam_private_api_chromeos.cc',
     ],
     'extensions_browser_sources_nonchromeos': [
       'browser/api/audio/audio_service.cc',