Change the functions in video_capture_device to pass around PowerLineFrequency enums instead of int…

media/capture/video/video_capture_device.h

 // 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.
 //
 // VideoCaptureDevice is the abstract base class for realizing video capture
 // device support in Chromium. It provides the interface for OS dependent
 // implementations.
 // The class is created and functions are invoked on a thread owned by
 // VideoCaptureManager. Capturing is done on other threads, depending on the OS
 // specific implementation.
@@ skipping 265 matching lines @@
   // into AllocateAndStart.
   //
   // If deallocation is done asynchronously, then the device implementation must
   // ensure that a subsequent AllocateAndStart() operation targeting the same ID
   // would be sequenced through the same task runner, so that deallocation
   // happens first.
   virtual void StopAndDeAllocate() = 0;
 
   // Gets the power line frequency, either from the params if specified by the
   // user or from the current system time zone.
-  int GetPowerLineFrequency(const VideoCaptureParams& params) const;
+  PowerLineFrequency GetPowerLineFrequency(
+      const VideoCaptureParams& params) const;
 
  private:
   // Gets the power line frequency from the current system time zone if this is
   // defined, otherwise returns 0.
-  int GetPowerLineFrequencyForLocation() const;
+  PowerLineFrequency GetPowerLineFrequencyForLocation() const;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_