Remove dead code related to media device enumerations and monitoring.

content/renderer/media/user_media_client_impl.h

Index: content/renderer/media/user_media_client_impl.h
diff --git a/content/renderer/media/user_media_client_impl.h b/content/renderer/media/user_media_client_impl.h
index 6931e7b69589e295f47011aeb0f425123e26832c..e9202d63f8b38d1b7c4ac2717e216c614597b458 100644
--- a/content/renderer/media/user_media_client_impl.h
+++ b/content/renderer/media/user_media_client_impl.h
@@ -78,13 +78,10 @@ class CONTENT_EXPORT UserMediaClientImpl
                                 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;
 
   // RenderFrameObserver override
   void WillCommitProvisionalLoad() override;