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

media/capture/video/video_capture_device.cc

Index: media/capture/video/video_capture_device.cc
diff --git a/media/capture/video/video_capture_device.cc b/media/capture/video/video_capture_device.cc
index 4b771e564ee9c05c0641bd14b5174cd4d005f6b6..e6a527c8f5d777d94556f0458a2ef03ec38002cc 100644
--- a/media/capture/video/video_capture_device.cc
+++ b/media/capture/video/video_capture_device.cc
@@ -138,10 +138,11 @@ VideoCaptureDevice::Client::Buffer::~Buffer() {
 VideoCaptureDevice::~VideoCaptureDevice() {
 }
 
-int VideoCaptureDevice::GetPowerLineFrequencyForLocation() const {
+media::PowerLineFrequency
+VideoCaptureDevice::GetPowerLineFrequencyForLocation() const {
   std::string current_country = base::CountryCodeForCurrentTimezone();
   if (current_country.empty())
-    return 0;
+    return media::PowerLineFrequency();
   // Sorted out list of countries with 60Hz power line frequency, from
   // http://en.wikipedia.org/wiki/Mains_electricity_by_country
   const char* countries_using_60Hz[] = {
@@ -153,17 +154,19 @@ int VideoCaptureDevice::GetPowerLineFrequencyForLocation() const {
       countries_using_60Hz + arraysize(countries_using_60Hz);
   if (std::find(countries_using_60Hz, countries_using_60Hz_end,
                 current_country) == countries_using_60Hz_end) {
-    return static_cast<int>(media::PowerLineFrequency::FREQUENCY_50HZ);
+    return media::PowerLineFrequency(
+      media::PowerLineFrequency::FREQUENCY_50HZ);
   }
-  return static_cast<int>(media::PowerLineFrequency::FREQUENCY_60HZ);
+  return media::PowerLineFrequency(
+    media::PowerLineFrequency::FREQUENCY_60HZ);
 }
 
-int VideoCaptureDevice::GetPowerLineFrequency(
+media::PowerLineFrequency VideoCaptureDevice::GetPowerLineFrequency(
     const VideoCaptureParams& params) const {
-  switch (params.power_line_frequency) {
+  switch (params.power_line_frequency.get()) {
     case media::PowerLineFrequency::FREQUENCY_50HZ:  // fall through
     case media::PowerLineFrequency::FREQUENCY_60HZ:
-      return static_cast<int>(params.power_line_frequency);
+      return params.power_line_frequency;
     default:
       return GetPowerLineFrequencyForLocation();
   }