Change the media::PowerLineFrequency from an enum class to a proper class

media/capture/video/linux/video_capture_device_linux.cc

 // 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.
 
 #include "media/capture/video/linux/video_capture_device_linux.h"
 
 #if defined(OS_OPENBSD)
 #include <sys/videoio.h>
 #else
 #include <linux/videodev2.h>
@@ skipping 114 matching lines @@
 
 void VideoCaptureDeviceLinux::SetRotation(int rotation) {
   if (v4l2_thread_.IsRunning()) {
     v4l2_thread_.message_loop()->PostTask(
         FROM_HERE,
         base::Bind(&V4L2CaptureDelegate::SetRotation, capture_impl_, rotation));
   }
 }
 
 // static
-int VideoCaptureDeviceLinux::TranslatePowerLineFrequencyToV4L2(int frequency) {
-  switch (frequency) {
-    case static_cast<int>(media::PowerLineFrequency::FREQUENCY_50HZ):
+int VideoCaptureDeviceLinux::TranslatePowerLineFrequencyToV4L2(
+  media::PowerLineFrequency frequency) {
+  switch (frequency.get()) {
+    case media::PowerLineFrequency::FREQUENCY_50HZ:
       return V4L2_CID_POWER_LINE_FREQUENCY_50HZ;
-    case static_cast<int>(media::PowerLineFrequency::FREQUENCY_60HZ):
+    case media::PowerLineFrequency::FREQUENCY_60HZ:
       return V4L2_CID_POWER_LINE_FREQUENCY_60HZ;
     default:
       // If we have no idea of the frequency, at least try and set it to AUTO.
       return V4L2_CID_POWER_LINE_FREQUENCY_AUTO;
   }
 }
 
 }  // namespace media