Fix gn_all build on gcc 4.8

chrome/browser/media/webrtc/media_stream_devices_controller.cc

Index: chrome/browser/media/webrtc/media_stream_devices_controller.cc
diff --git a/chrome/browser/media/webrtc/media_stream_devices_controller.cc b/chrome/browser/media/webrtc/media_stream_devices_controller.cc
index ea1c264f62b67e56e48482d26ceafad68e621440..31119bf51972bb1ea041bc369056549fbc56bf6a 100644
--- a/chrome/browser/media/webrtc/media_stream_devices_controller.cc
+++ b/chrome/browser/media/webrtc/media_stream_devices_controller.cc
@@ -253,7 +253,7 @@ class MediaStreamDevicesController::MediaPermissionStatus {
 // Implementation of PermissionPromptDelegate which actually shows a permission
 // prompt.
 class MediaStreamDevicesController::PermissionPromptDelegateImpl
-    : public MediaStreamDevicesController::PermissionPromptDelegate {
+    : public internal::PermissionPromptDelegate {
  public:
   void ShowPrompt(
       bool user_gesture,
@@ -404,7 +404,7 @@ void MediaStreamDevicesController::RequestPermissionsWithDelegate(
     content::WebContents* web_contents,
     const content::MediaStreamRequest& request,
     const content::MediaResponseCallback& callback,
-    PermissionPromptDelegate* delegate) {
+    internal::PermissionPromptDelegate* delegate) {
   if (request.request_type == content::MEDIA_OPEN_DEVICE_PEPPER_ONLY) {
     MediaPermissionRequestLogger::LogRequest(
         web_contents, request.render_process_id, request.render_frame_id,