Remove dead code related to media device enumerations and monitoring.

content/renderer/pepper/pepper_media_device_manager.h

Index: content/renderer/pepper/pepper_media_device_manager.h
diff --git a/content/renderer/pepper/pepper_media_device_manager.h b/content/renderer/pepper/pepper_media_device_manager.h
index 8580459d82a232c18c7dbb81143d626695cb23e6..ff7bc3bb2cccc7dab317f18a18b85dc8a161122a 100644
--- a/content/renderer/pepper/pepper_media_device_manager.h
+++ b/content/renderer/pepper/pepper_media_device_manager.h
@@ -74,13 +74,10 @@ class PepperMediaDeviceManager
       content::MediaStreamRequestResult result) override;
   void OnDeviceStopped(const std::string& label,
                        const StreamDeviceInfo& device_info) override;
-  void OnDevicesEnumerated(int request_id,
-                           const StreamDeviceInfoArray& device_array) override;
   void OnDeviceOpened(int request_id,
                       const std::string& label,
                       const StreamDeviceInfo& device_info) override;
   void OnDeviceOpenFailed(int request_id) override;
-  void OnDevicesChanged() override;
 
   // Stream type conversion.
   static MediaStreamType FromPepperDeviceType(PP_DeviceType_Dev type);